Document:

<PAGE>

                                                                    Exhibit 4.20

                              POLAROID CORPORATION

             __%[Convertible][Cumulative] Preferred Stock, Series __

Cusip No.:  _________                                        ___________ Shares

                  THIS CERTIFIES THAT__________________________________________
is the owner of fully paid and non-assessable shares of ____%
[Convertible][Cumulative] Preferred Stock, Series ___, par value $1.00 per
share, of POLAROID CORPORATION, a corporation incorporated under the laws of
Delaware (the "Corporation"), transferable on the books of the Corporation by
the holder hereof in person or by its duly authorized attorney, upon surrender
of this Certificate properly endorsed. This Certificate and the shares
represented hereby are issued and shall be held subject to all of the provisions
of the Certificate of Designations, Powers, Preferences and Rights of the __%
[Convertible] [Cumulative] Preferred Stock, Series __, the Restated Certificate
of Incorporation of the Corporation, as amended, and the By-laws of the
Corporation and any amendments or restatements thereto. This Certificate is not
valid unless countersigned and registered by the Transfer Agent and Registrar.

         IN WITNESS WHEREOF, the Corporation has caused this Certificate to be
executed on its behalf by its duly authorized officers.

                                                POLAROID CORPORATION

                                                By:  _____________________
                                                     Name:
                                                     Title:

Countersigned and Registered:

----------------------------
Transfer Agent and Registrar

By: _______________________,
      Authorized signatory

Dated: _________________

<PAGE>

                                                                              2

                  The Corporation will furnish without charge to each
stockholder who so requests a description of the powers, designations,
preferences and relative, participating, optional or other special rights, and
the qualifications, limitations or restrictions, of each class of capital stock
or series thereof which the corporation is authorized to issue. Such request
should be directed to the office of the Secretary of the Corporation, 784
Memorial Drive, Cambridge, Massachusetts 02139, telephone number: (781)
386-2000.

                        ---------------------------------
   KEEP THIS CERTIFICATE IN A SAFE PLACE. IF IT IS LOST, STOLEN OR DESTROYED,
       THE CORPORATION WILL REQUIRE A BOND OF INDEMNITY AS A CONDITION TO
                   THE ISSUANCE OF A REPLACEMENT CERTIFICATE.

                        ---------------------------------

                  The following abbreviations, when used in the inscription on
the face of this Certificate, shall be construed as though they were written out
in full according to applicable laws or regulations:

TEN COM--  as tenants in common             UNIF GIFT MIN ACT_____ (Custodian)__
                                                          (Custodian)    (Minor)
TEN ENT --  as tenants by the entireties   under Uniform Gifts to Minors Act of
                                           ____________
                                             (State)

JT TEN      --  as joint tenants with right of
                survivorship and not as tenants
                in common

     Additional abbreviations may also be used though not in the above list.

<PAGE>

                                                                              3

                                 ASSIGNMENT FORM

                  FOR VALUE RECEIVED, __________________________________________
HEREBY SELL, ASSIGN AND TRANSFER UNTO

PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF

ASSIGNEE

----------------------------------------

----------------------------------------

------------------------------------------------------------------------------
  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

____________________________ shares of ____% [Convertible] [Cumulative]
Preferred Stock Series ____ of the Corporation represented by this Certificate
and do hereby irrevocably constitute and appoint __________________ Attorney to
transfer the said shares of ____% [Convertible] [Cumulative] Preferred Stock,
Series ____ on the books of the Corporation, with full power of substitution in
the premises.

Dated:  _______________________

             Signature:_____________________________________________
                        NOTICE: The signature to this assignment must correspond
                        with the name as written upon the face of the
                        certificate in every particular, without alteration or
                        enlargement or any change whatever.

Signature(s) Guaranteed:

By:__________________

THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION,
(BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS) WITH
MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM) PURSUANT TO
S.E.C. RULE 17AD-15.

<PAGE>

                                                                               4

                          NOTICE OF ELECTION TO CONVERT

                  If you want to elect to have all of the shares of Series __
Preferred Stock represented by this Certificate converted by the Company into
_____ shares of common stock, par value $1.00 per share, of the Company pursuant
to Section 4(a) of the Certificate of Designations, please check the box below:

  / / Convert all shares of Series ___ Preferred Stock pursuant to Section 4(a)

                  If you want to elect to have only part of the shares of Series
__ Preferred Stock represented by this Certificate converted by the Company into
_____ shares of common stock, par value $1.00 per share, of the Company pursuant
to Section 4(a) of the Certificate of Designations, state the amount you elect
to have converted:

                  $
                   ------------.

           Your Signature: ____________________________________________________

                   (SIGN EXACTLY AS YOUR NAME APPEARS ON THE FACE OF THIS NOTE)

                                Tax Identification No.: _______________________

                                    Date: _____________________________________

Signature Guarantee: ___________________<PAGE>

                                                                   Exhibit 4.21

===============================================================================

                              POLAROID CORPORATION

                                       AND

                          [-------------------------],
                           As Purchase Contract Agent

                           PURCHASE CONTRACT AGREEMENT

                         Dated as of [___________], 1999

===============================================================================

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                                                 TABLE OF CONTENTS

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                                                     ARTICLE I
                             Definitions and Other Provisions of General Applications

Section 1.1.          Definitions.................................................................................1
Section 1.2.          Compliance Certificates and Opinions.......................................................11
Section 1.3.          Form of Documents Delivered to Agent.......................................................12
Section 1.4.          Acts of Holders; Record Dates..............................................................12
Section 1.5.          Notices....................................................................................13
Section 1.6.          Notice to Holders; Waiver..................................................................14
Section 1.7.          Effect of Headings and Table of Contents...................................................15
Section 1.8.          Successors and Assigns.....................................................................15
Section 1.9.          Separability Clause........................................................................15
Section 1.10.         Benefits of Agreement......................................................................15
Section 1.11.         Governing Law..............................................................................15
Section 1.12.         Legal Holidays.............................................................................15
Section 1.13.         Counterparts...............................................................................16
Section 1.14.         Inspection of Agreement....................................................................16

                                                    ARTICLE II
                                                 Certificate Forms

Section 2.1.          Forms of Certificates Generally............................................................16
Section 2.2.          Form of Agent's Certificate of Authentication..............................................17

                                                    ARTICLE III
                                                  The Securities

Section 3.1.          Amount; Form and Denominations.............................................................18
Section 3.2.          Rights and Obligations Evidenced by the Certificates.......................................18
Section 3.3.          Execution, Authentication, Delivery and Dating.............................................19
Section 3.4.          Temporary Certificates.....................................................................19
Section 3.5.          Registration; Registration of Transfer and Exchange........................................20
Section 3.6.          Book-Entry Interests.......................................................................21
Section 3.7.          Notices to Holders.........................................................................22
Section 3.8.          Appointment of Successor Clearing Agency...................................................22
Section 3.9.          Definitive Certificates....................................................................22
Section 3.10.         Mutilated, Destroyed, Lost and Stolen Certificates.........................................22
Section 3.11.         Persons Deemed Owners......................................................................23
Section 3.12.         Cancellation...............................................................................24
Section 3.13.         Substitution of Securities.................................................................24
Section 3.14.         Reestablishment of Type A Units............................................................25
Section 3.15.         Transfer of Collateral upon Occurrence of Termination Event................................26

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Section 3.16.         No Consent to Assumption...................................................................27

                                                    ARTICLE IV
                                                  The Debentures

Section 4.1.          Payment of Interest; Rights to Interest Preserved; Interest Rate Reset.....................27
Section 4.2.          Notice and Voting..........................................................................28

                                                     ARTICLE V
                                              The Purchase Contracts

Section 5.1.          Purchase of Shares of Common Stock.........................................................29
Section 5.2.          Contract Adjustment Payments...............................................................30
Section 5.3.          [Intentionally omitted]....................................................................31
Section 5.4.          Payment of Purchase Price..................................................................31
Section 5.5.          Issuance of Shares of Common Stock.........................................................34
Section 5.6.          Adjustment of Settlement Rate..............................................................35
Section 5.7.          Notice of Adjustments and Certain Other Events.............................................40
Section 5.8.          Termination Event; Notice..................................................................40
Section 5.9.          Early Settlement...........................................................................41
Section 5.10.         No Fractional Shares.......................................................................42
Section 5.11.         Charges and Taxes..........................................................................42

                                                    ARTICLE VI
                                                     Remedies

Section 6.1.          Unconditional Right of Holders to Receive Contract Adjustment Payments and
                      to Purchase Common Stock...................................................................43
Section 6.2.          Restoration of Rights and Remedies.........................................................43
Section 6.3.          Rights and Remedies Cumulative.............................................................43
Section 6.4.          Delay or Omission Not Waiver...............................................................44
Section 6.5.          Undertaking for Costs......................................................................44
Section 6.6.          Waiver of Stay or Extension Laws...........................................................44

                                                    ARTICLE VII
                                                     The Agent

Section 7.1.          Certain Duties and Responsibilities........................................................45
Section 7.2.          Notice of Default..........................................................................46
Section 7.3.          Certain Rights of Agent....................................................................46
Section 7.4.          Not Responsible for Recitals or Issuance of Securities.....................................47
Section 7.5.          May Hold Securities........................................................................47
Section 7.6.          Money Held in Custody......................................................................47
Section 7.7.          Compensation and Reimbursement.............................................................47
Section 7.8.          Corporate Agent Required; Eligibility......................................................48

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Section 7.9.          Resignation and Removal; Appointment of Successor..........................................48
Section 7.10.         Acceptance of Appointment by Successor.....................................................49
Section 7.11.         Merger, Conversion, Consolidation or Succession to Business................................50
Section 7.12.         Preservation of Information; Communications to Holders.....................................50
Section 7.13.         No Obligations of Agent....................................................................50
Section 7.14.         Tax Compliance.............................................................................51

                                                   ARTICLE VIII
                                              Supplemental Agreements

Section 8.1.          Supplemental Agreements Without Consent of Holders.........................................51
Section 8.2.          Supplemental Agreements With Consent of Holders............................................52
Section 8.3.          Execution of Supplemental Agreements.......................................................53
Section 8.4.          Effect of Supplemental Agreements..........................................................53
Section 8.5.          Reference to Supplemental Agreements.......................................................53

                                                    ARTICLE IX
                                     Consolidation, Merger, Sale or Conveyance

Section 9.1.          Covenant Not to Merge, Consolidate, Sell or Convey Property Except Under
                      Certain Conditions.........................................................................54
Section 9.2.          Rights and Duties of Successor Corporation.................................................54
Section 9.3.          Opinion of Counsel Given to Agent..........................................................55

                                                     ARTICLE X
                                                     Covenants

Section 10.1.         Performance Under Purchase Contracts.......................................................55
Section 10.2.         Maintenance of Office or Agency............................................................55
Section 10.3.         Company to Reserve Common Stock............................................................56
Section 10.4.         Covenants as to Common Stock...............................................................56
Section 10.5.         Statements of Officers of the Company as to Default........................................56
Section 10.6.         ERISA .....................................................................................56

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                                      -iii-

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<S>                  <C>

EXHIBIT A            Form of Type A Units Certificate
EXHIBIT B            Form of Type B Units Certificate
EXHIBIT C            Instruction to Purchase Contract Agent
EXHIBIT D            Notice from Purchase Contract Agent to Holders (Transfer of Collateral upon
                     Occurrence of a Termination Event)
EXHIBIT E            Notice to Settle by Separate Cash
EXHIBIT F            Notice from Purchase Contract Agent to Collateral Agent and Indenture Trustee
                     (Payment of Purchase Contract Settlement Price)

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                                      -iv-

<PAGE>

                  PURCHASE CONTRACT AGREEMENT, dated as of [            ], 1999,
between POLAROID CORPORATION, a Delaware corporation (the "Company"), and
[___________________________], a [______________________] corporation, acting as
purchase contract agent for the Holders of Securities from time to time
(the "Agent").

                              W I T N E S S E T H :

         WHEREAS, the Company has duly authorized the execution and delivery of
this Agreement and the Certificates evidencing the Securities; and

         WHEREAS, all things necessary to make the Purchase Contracts (as
defined herein), when the Certificates are executed by the Company and
authenticated, executed on behalf of the Holders (as defined herein) and
delivered by the Agent (as defined herein), as provided in this Agreement, the
valid obligations of the Company, and to constitute these presents a valid
agreement of the Company, in accordance with its terms, have been done;

         NOW, THEREFORE, THIS AGREEMENT WITNESSETH:  for and in consideration of
the premises and the purchase of the Securities by the Holders thereof, it is
mutually agreed as follows:

                                    ARTICLE I

            Definitions and Other Provisions of General Applications

Section 1.1.      DEFINITIONS.

         For all purposes of this Agreement, except as otherwise expressly
provided or unless the context otherwise requires:

                  (a) unless otherwise stated herein, the terms defined in this
         Article have the meanings assigned to them in this Article and include
         the plural as well as the singular, and nouns and pronouns of the
         masculine gender include the feminine and neuter genders;

                  (b) all accounting terms not otherwise defined herein have the
         meanings assigned to them in accordance with generally accepted
         accounting principles in the United States;

                  (c) the words "herein," "hereof" and "hereunder" and other
         words of similar import refer to this Agreement as a whole and not to
         any particular Article, Section, Exhibit or other subdivision;

                  (d) the following terms have the meanings given to them in the
         Supplemental Indenture: (i) Remarketing; and (ii) Reset Rate; and

<PAGE>

                  (e) the following terms have the meanings given to them in
this Section 1.1(e):

         "Act," when used with respect to any Holder, has the meaning specified
in Section 1.4.

         "Adjusted Contract Adjustment Payment Rate," with respect to any Reset
Transaction, means the rate per annum that is the arithmetic average of the
rates quoted by two Reference Dealers selected by the Company or its successor
as the rate at which Contract Adjustment Payments should accrue so that the
fimmediately after the later of (i) public announcement of such Reset
Transaction or (ii) public announcement of a change in dividend policy in
connection with such Reset Transaction will equal the average Trading Price of a
Type A Unit for the 20 Trading Days immediately preceding the date of public
announcement of such Reset Transaction; provided that the Adjusted Contract
Adjustment Payment Rate shall not be less than [____]% per annum.

         "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For the purposes of this definition,
"control" when used with respect to any specified Person means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

         "Agent" means the Person named as the "Agent" in the first paragraph of
this instrument until a successor Agent shall have become such pursuant to the
applicable provisions of this Agreement, and thereafter "Agent" shall mean such
Person.

         "Agreement" means this instrument as originally executed or as it may
from time to time be supplemented or amended by one or more agreements
supplemental hereto entered into pursuant to the applicable provisions hereof.

         "Applicable Market Value" has the meaning specified in Section 5.1.

         "Bankruptcy Code" means Title 11 of the United States Code, or any
other law of the United States that from time to time provides a uniform system
of bankruptcy laws.

         "Beneficial Owner" means, with respect to a Global Certificate, a
Person who is the beneficial owner of such Book-Entry Interest as reflected on
the books of the Clearing Agency or on the books of a Person maintaining an
account with such Clearing Agency (directly as a Clearing Agency Participant or
as an indirect participant, in each case in accordance with the rules of such
Clearing Agency).

         "Board of Directors" means the board of directors of the Company or a
duly authorized committee of that board.

         "Board Resolution" means one or more resolutions of the Board of
Directors, a copy of each of which has been certified by the Secretary or an
Assistant Secretary of the Company to

<PAGE>

have been duly adopted by the Board of Directors and to be in full force and
effect on the date of such certification and delivered to the Agent.

         "Book-Entry Interest" means a beneficial interest in a Global
Certificate, ownership and transfers of which shall be maintained and made
through book entries by a Clearing Agency as described in Section 3.6.

         "Business Day" means any day other than a Saturday or Sunday or a day
on which banking institutions in The City of New York are authorized or required
by law or executive order to remain closed or a day on which the Indenture
Trustee is closed for business; provided that for purposes of the second
paragraph of Section 1.12 only, the term "Business Day" shall also be deemed to
exclude any day on which trading on the New York Stock Exchange, Inc. is closed
or suspended.

         "Cash Settlement" has the meaning set forth in Section 5.4(a)(i).

         "Certificate" means a Type A Unit Certificate or a Type B Unit
Certificate.

         "Clearing Agency" means an organization registered as a "Clearing
Agency" pursuant to Section 17A of the Exchange Act that is acting as a
depositary for the Securities and in whose name, or in the name of a nominee of
that organization, shall be registered a Global Certificate and which shall
undertake to effect book entry transfers and pledges of the Securities.

         "Clearing Agency Participant" means a broker, dealer, bank, other
financial institution or other Person for whom from time to time the Clearing
Agency effects book entry transfers and pledges of securities deposited with the
Clearing Agency.

         "Closing Price" has the meaning specified in Section 5.1.

         "Code" means the Internal Revenue Code of 1986, as amended.

         "Collateral" has the meaning specified in Section 1 of the Pledge
Agreement.

         "Collateral Account" has the meaning specified in the Pledge Agreement.

         "Collateral Agent" means [_____________ ], as Collateral Agent under
the Pledge Agreement until a successor Collateral Agent shall have become
such pursuant to the applicable provisions of the Pledge Agreement, and
thereafter "Collateral Agent" shall mean the Person who is then the
Collateral Agent thereunder.

         "Collateral Substitution" has the meaning specified in Section 3.13.

         "Common Stock" means the Common Shares, par value $1.00, of the
Company.

<PAGE>

         "Company" means the Person named as the "Company" in the first
paragraph of this instrument until a successor shall have become such pursuant
to the applicable provision of this Agreement, and thereafter "Company" shall
mean such successor.

         "Contract Adjustment Payments" means, (a) if a Reset Transaction has
not occurred, the fee payable by the Company in respect of each Purchase
Contract, equal to [____]% per annum of the Stated Amount, or (b) following the
occurrence of a Reset Transaction, the Adjusted Contract Adjustment Payment Rate
related to such Reset Transaction until any succeeding Reset Transaction shall
occur, computed (i) for any full quarterly period on the basis of a 360-day year
of twelve 30-day months and (ii) for any period shorter than a full quarterly
period for which such payments are calculated, on the basis of a 30-day month
and, for periods of less than a month, the actual number of days elapsed per
30-day month.

         "Type A Units" means the collective rights and obligations of a Holder
of a Type A Unit Certificate in respect of the Debentures, subject to the Pledge
thereof, and the related Purchase Contract.

         "Type A Unit Certificate" means a certificate evidencing the rights and
obligations of a Holder in respect of the number of Type A Units specified on
such certificate, substantially in the form of Exhibit A hereto.

         "Type A Units Register" and "Type A Units Registrar" have the
respective meanings specified in Section 3.5.

         "Corporate Trust Office" means the principal corporate trust office of
the Agent at which, at any particular time, its corporate trust business shall
be administered, which office at the date
hereof is located at [______________] Attention: [______________].

         "Coupon Rate" means the percentage rate per annum at which each
Debenture will bear interest initially.

         "Current Market Price" has the meaning specified in Section 5.6(a)(8).

         "Debentures" means the series of debentures to be issued by the Company
under the Supplemental Indenture.

         "Depositary" means DTC until another Clearing Agency becomes its
successor.

         "Dividend Yield," on any security for any period, means the dividends
paid or proposed to be paid pursuant to an announced dividend policy on such
security for such period divided by, if with respect to dividends paid on such
security, the average Closing Price of such security during such period and, if
with respect to dividends so proposed to be paid on such security, the Closing
Price of such security on the effective date of the related Reset Transaction.

         "DTC" means The Depository Trust Company, the initial Clearing Agency.

<PAGE>

         "Early Settlement" has the meaning specified in Section 5.9(a).

         "Early Settlement Amount" has the meaning specified in Section 5.9(a).

         "Early Settlement Date" has the meaning specified in Section 5.9(a).

         "Early Settlement Rate" has the meaning specified in Section 5.9(b).

         "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended.

         "Exchange Act" means the Securities Exchange Act of 1934 and any
statute successor thereto, in each case as amended from time to time, and the
rules and regulations promulgated thereunder.

         "Expiration Date" has the meaning specified in Section 1.4.

         "Expiration Time" has the meaning specified in Section 5.6(a)(6).

         "Global Certificate" means a Certificate that evidences all or part of
the Securities and is registered in the name of a Clearing Agency or a nominee
thereof.

         "Holder," when used with respect to a Security, means the Person in
whose name the Security evidenced by a Type A Unit Certificate and/or a Type B
Unit Certificate is registered in the related Type A Units Register and/or the
Type B Units Register, as the case may be; PROVIDED, HOWEVER, that in
determining whether the Holders of the requisite number of Type A Units and/or
Type B Units have voted on any matter, then for the purpose of such
determination only (and not for any other purpose hereunder), if the Security
remains in the form of one or more Global Certificates and if the Clearing
Agency which is the holder of such Global Certificate has sent an omnibus proxy
assigning voting rights to the Clearing Agency Participants to whose accounts
the Securities are credited on the record date, the term "Holder" shall mean
such Clearing Agency Participant acting at the direction of the Beneficial
Owners.

         "Indenture" means the Indenture, dated as of January 9, 1997, between
the Company and the Indenture Trustee, as amended and supplemented (including
any provisions of the TIA that are deemed incorporated therein and including the
Supplemental Indenture).

         "Indenture Trustee" means State Street Bank and Trust Company, a
Massachusetts corporation, as trustee under the Indenture, or any successor
thereto.

         "Issuer Order" or "Issuer Request" means a written request or order
signed in the name of the Company by its Chairman of the Board, its President or
one of its Vice Presidents, and by its Treasurer, an Assistant Treasurer, its
Secretary or an Assistant Secretary, and delivered to the Agent.

         "NYSE" has the meaning specified in Section 5.1.

<PAGE>

         "Officers' Certificate" means a certificate signed by the Chairman of
the Board, its President or one of its Vice Presidents, and by the Treasurer, an
Assistant Treasurer, the Secretary or an Assistant Secretary, of the Company,
and delivered to the Agent. Any Officers' Certificate delivered with respect to
compliance with a condition or covenant provided for in this Agreement shall
include:

                  (a) a statement that each officer signing the Officers'
         Certificate has read the covenant or condition and the definitions
         relating thereto;

                  (b) a brief statement of the nature and scope of the
         examination or investigation undertaken by each officer in rendering
         the Officers' Certificate;

                  (c) a statement that each such officer has made such
         examination or investigation as, in such officer's opinion, is
         necessary to enable such officer to express an informed opinion as to
         whether or not such covenant or condition has been complied with; and

                  (d) a statement as to whether, in the opinion of each such
         officer, such condition or covenant has been complied with.

         "Opinion of Counsel" means a written opinion of counsel, who may be
counsel for the Company (and who may be an employee of the Company), and who
shall be reasonably acceptable to the Agent. An opinion of counsel may rely on
certificates as to matters of fact.

         "Outstanding Securities," with respect to any Type A Unit or Type B
Unit, means, as of the date of determination, all Type A Units or Type B Units
evidenced by Certificates theretofore authenticated, executed and delivered
under this Agreement, except:

                       (i) If a Termination Event has occurred, (A) Type B Units
         and (B) Type A Units for which the underlying Debentures have been
         theretofore deposited with the Agent in trust for the Holders of such
         Type A Units;

                      (ii) Type A Units and Type B Units evidenced by
         Certificates theretofore cancelled by the Agent or delivered to the
         Agent for cancellation or deemed cancelled pursuant to the provisions
         of this Agreement; and

                     (iii) Type A Units and Type B Units evidenced by
         Certificates in exchange for or in lieu of which other Certificates
         have been authenticated, executed on behalf of the Holder and delivered
         pursuant to this Agreement, other than any such Certificate in respect
         of which there shall have been presented to the Agent proof
         satisfactory to it that such Certificate is held by a bona fide
         purchaser in whose hands the Type A Units or Type B Units evidenced by
         such Certificate are valid obligations of the Company;

PROVIDED, HOWEVER, that in determining whether the Holders of the requisite
number of the Type A Units or Type B Units have given any request, demand,
authorization, direction, notice, consent or waiver hereunder, Type A Units or
Type B Units owned by the Company or any Affiliate of the Company shall be
disregarded and deemed not to be Outstanding Securities,

<PAGE>

except that, in determining whether the Agent shall be protected in relying upon
any such request, demand, authorization, direction, notice, consent or waiver,
only Type A Units or Type B Units which a Responsible Officer of the Agent knows
to be so owned shall be so disregarded. Type A Units or Type B Units so owned
which have been pledged in good faith may be regarded as Outstanding Securities
if the pledgee establishes to the satisfaction of the Agent the pledgee's right
so to act with respect to such Type A Units or Type B Units and that the pledgee
is not the Company or any Affiliate of the Company.

         "Payment Date" means each [__________], [__________], [__________] and
[__________], commencing [__________], [_______].

         "Permitted Investments" has the meaning set forth in Section 1 of the
Pledge Agreement.

         "Person" means a legal person, including any individual, corporation,
estate, partnership, joint venture, association, joint-stock company, limited
liability company, trust, unincorporated organization or government or any
agency or political subdivision thereof or any other entity of whatever nature.

         "Units" means the collective reference to the Type A Units and the Type
B Units.

         "Plan" means an employee benefit plan that is subject to ERISA, a plan
or individual retirement account that is subject to Section 4975 of the Code or
any entity whose assets are considered assets of any such plan.

         "Pledge" means the pledge under the Pledge Agreement of the Debentures
or the Treasury Securities in each case constituting a part of the Securities.

         "Pledge Agreement" means the Pledge Agreement, dated as of the date
hereof, by and among the Company, the Collateral Agent, the Securities
Intermediary and the Agent, on its own behalf and as attorney-in-fact for the
Holders from time to time of the Securities.

         "Pledged Debentures" has the meaning set forth in the Pledge Agreement.

         "Pledged Treasury Securities" has the meaning set forth in the Pledge
Agreement.

         "Predecessor Certificate" means a Predecessor Type A Unit Certificate
or a Predecessor Type B Unit Certificate.

         "Predecessor Type A Unit Certificate" of any particular Type A Unit
Certificate means every previous Type A Unit Certificate evidencing all or a
portion of the rights and obligations of the Company and the Holder under the
Type A Units evidenced thereby; and, for the purposes of this definition, any
Type A Unit Certificate authenticated and delivered under Section 3.10 in
exchange for or in lieu of a mutilated, destroyed, lost or stolen Type A Unit
Certificate shall be deemed to evidence the same rights and obligations of the
Company and the Holder as the mutilated, destroyed, lost or stolen Type A Unit
Certificate.

<PAGE>

         "Predecessor Type B Unit Certificate" of any particular Type B Unit
Certificate means every previous Type B Unit Certificate evidencing all or a
portion of the rights and obligations of the Company and the Holder under the
Type B Units evidenced thereby; and, for the purposes of this definition, any
Type B Unit Certificate authenticated and delivered under Section 3.10 in
exchange for or in lieu of a mutilated, destroyed, lost or stolen Type B Unit
Certificate shall be deemed to evidence the same rights and obligations of the
Company and the Holder as the mutilated, destroyed, lost or stolen Type B Unit
Certificate.

         "Proceeds" has the meaning set forth in Section 1 of the Pledge
Agreement.

         "Purchase Contract," when used with respect to any Security, means the
contract forming a part of such Security and obligating the Company to (i) sell
and the Holder of such Security to purchase Common Stock and (ii) pay the Holder
Contract Adjustment Payments, if any, in each case on the terms and subject to
the conditions set forth in Article Five hereof.

         "Purchase Contract Settlement Date" means [__________], [____].

         "Purchase Contract Settlement Fund" has the meaning specified in
Section 5.5.

         "Purchase Price" has the meaning specified in Section 5.1.

         "Purchased Shares" has the meaning specified in Section 5.6(a)(6).

         "Record Date" for the Contract Adjustment Payments payable on any
Payment Date means, as to any Global Certificate, the Business Day next
preceding such Payment Date, and as to any other Certificate, 15 Business Days
prior to such Payment Date.

         "Reference Dealer" means a dealer engaged in the trading of convertible
securities.

         "Register" means the Type A Units Register and the Type B Units
Register.

         "Registrar" means the Type A Units Registrar and the Type B Units
Registrar.

         "Remarketing Agent" has the meaning specified in Section 5.4(b).

         "Remarketing Agreement" means the Remarketing Agreement dated as of
[__________], by and between the Company and the Remarketing Agent.

         "Reorganization Event" has the meaning specified in Section 5.6(b).

         "Reset Transaction" means a merger, consolidation or statutory share
exchange to which the Person that is the issuer of the common shares for which
the Purchase Contracts are then to be settled is a party, a sale of all or
substantially all assets of such Person, a recapitalization of such commonshares
or a distribution described in Section 5.6(a)(4) by such Person and after the
effective date of such transaction the Purchase Contracts are then to be settled
for common shares of a Person (i) which had a Dividend Yield for the four fiscal
quarters immediately preceding the

<PAGE>

public announcement thereof which was, or (ii) that announces a dividend policy
prior to the effective date thereof which policy, if implemented, would result
in a Dividend Yield on such common shares for the next four fiscal quarters
which would be, more than 250 basis points higher than the Dividend Yield on the
common shares for which the Purchase Contracts are to be settled prior to such
effective date for the four fiscal quarters immediately preceding such public
announcement.

         "Responsible Officer," when used with respect to the Agent, means any
officer of the Agent assigned by the Agent to administer its corporate trust
matters.

         "Security" means a Type A Unit or a Type B Unit.

         "Securities Intermediary" means [_____________________], as Securities
Intermediary under the Pledge Agreement until a successor Securities
Intermediary shall have become such pursuant to the applicable provisions of the
Pledge Agreement, and thereafter "Securities Intermediary" shall mean such
successor.

         "Settlement Rate" has the meaning specified in Section 5.1.

         "Stated Amount" means $[50] in cash.

         "Supplemental Indenture" means the Supplemental Indenture, dated as of
________ __, 1999, between the Company and the Trustee, supplementing the
Indenture and pursuant to which the Debentures will be issued.

         "Termination Date" means the date, if any, on which a Termination Event
occurs.

         "Termination Event" means the occurrence of any of the following
events: (i) at any time on or prior to the Purchase Contract Settlement Date, a
judgment, decree or court order shall have been entered granting relief with
respect to the Company under the Bankruptcy Code or any other similar applicable
Federal or State law, adjudicating the Company to be insolvent, or approving as
properly filed a petition seeking reorganization or liquidation of the Company,
and, unless such judgment, decree or order shall have been entered within 60
days prior to the Purchase Contract Settlement Date, such decree or order shall
have continued undischarged and unstayed for a period of 60 days; or (ii) a
judgment, decree or court order for the appointment of a receiver or liquidator
or trustee or assignee in bankruptcy or insolvency of the Company or of its
property, or for the winding up or liquidation of its affairs, shall have been
entered, and, unless such judgment, decree or order shall have been entered
within 60 days prior to the Purchase Contract Settlement Date, such judgment,
decree or order shall have continued undischarged and unstayed for a period of
60 days; or (iii) at any time on or prior to the Purchase Contract Settlement
Date, the Company shall file a petition for relief under the Bankruptcy Code, or
shall consent to the filing of a bankruptcy proceeding against it, or shall file
a petition or answer or consent seeking reorganization or liquidation of the
Company under the Bankruptcy Code or any other similar applicable Federal or
State law, or shall consent to the filing of any such petition, or shall consent
to the appointment of a receiver or liquidator or trustee or assignee

<PAGE>

in bankruptcy or insolvency of it or of its property, or shall make an
assignment for the benefit of its creditors, or shall admit in writing its
inability to pay its debts generally as they become due.

         "Threshold Appreciation Price" has the meaning specified in Section
5.1.

         "TIA" means the Trust Indenture Act of 1939, as amended from time to
time, or any successor legislation.

         "Trading Day" has the meaning specified in Section 5.1.

         "Trading Price" of a security on any date of determination means (i)
the closing sale price (or, if no closing price is reported, the last reported
sale price) of a security (regular way) on the NYSE on such date, (ii) if such
security is not listed for trading on the NYSE on any such date, the closing
sale price as reported in the composite transactions for the principal United
States securities exchange on which such security is so listed, (iii) if such
security is not so listed on a United States national or regional securities
exchange, the closing sale price as reported by The NASDAQ Stock Market, (iv) if
such security is not so reported, the price quoted by Interactive Data
Corporation for such security or, if Interactive Data Corporation is not quoting
such price, a similar quotation service selected by the Company, (v) if such
security is not so quoted, the average of the mid-point of the last bid and ask
prices for such security from at least two dealers recognized as market-makers
for such security, or (vi) if such security is not so quoted, the average of the
last bid and ask prices for such security from a Reference Dealer.

         "Treasury Security" means zero-coupon U.S. Treasury Securities (Cusip
Number ________) which are the principal strip of the __% U. S. Treasury
Securities which mature on [___________], [____________].

         "Type A Register" and "Type A Registrar" have the respective meanings
specified in Section 3.5.

         "Type A Units" means the collective rights and obligations of a Holder
of a Type A Unit Certificate in respect of the Debentures subject to the Pledge
thereof, and the related Purchase Contract.

         "Type B Units" means, following the substitution of one or more
Treasury Securities for Debentures as collateral to secure a holder's
obligations under a Purchase Contract, the collective rights and obligations of
a Holder of a Type B Unit Certificate in respect of such Treasury Securities,
subject in each case to the Pledge thereof, and the related Purchase Contract.

         "Type A Unit Certificate" means a certificate evidencing the rights and
obligations of a Holder in respect of the number of Type A Units specified on
such certificate, substantially in the form of Exhibit A hereto.

         "Type B Unit Certificate" means a certificate evidencing the rights and
obligations of a Holder in respect of the number of Type B Units specified on
such certificate, substantially in the form of Exhibit A hereto.

<PAGE>

         "Type A Units Register" and "Type A Units Registrar" have the
respective meanings specified in Section 3.5.

         "Type B Units Register" and "Type B Units Registrar" have the
respective meanings specified in Section 3.5.

         "Underwriting Agreement" means the Underwriting Agreement dated
[_________], [ ] among the Company, [              ].

         "Vice President" means any vice president, whether or not designated by
a number or a word or words added before or after the title "vice president."

Section 1.2.      COMPLIANCE CERTIFICATES AND OPINIONS.

         Except as otherwise expressly provided by this Agreement, upon any
application or request by the Company to the Agent to take any action in
accordance with any provision of this Agreement, the Company shall furnish to
the Agent an Officers' Certificate stating that all conditions precedent, if
any, provided for in this Agreement relating to the proposed action have been
complied with and, if requested by the Agent, an Opinion of Counsel stating
that, in the opinion of such counsel, all such conditions precedent, if any,
have been complied with, except that in the case of any such application or
request as to which the furnishing of such documents is specifically required by
any provision of this Agreement relating to such particular application or
request, no additional certificate or opinion need be furnished.

         Every certificate or opinion with respect to compliance with a
condition or covenant provided for in this Agreement shall include:

                  (1) a statement that each individual signing such certificate
         or opinion has read such covenant or condition and the definitions
         herein relating thereto;

                  (2) a brief statement as to the nature and scope of the
         examination or investigation upon which the statements or opinions
         contained in such certificate or opinion are based;

                  (3) a statement that, in the opinion of each such individual,
         he or she has made such examination or investigation as is necessary to
         enable such individual to express an informed opinion as to whether or
         not such covenant or condition has been complied with; and

                  (4) a statement as to whether, in the opinion of each such
         individual, such condition or covenant has been complied with.

Section 1.3.      FORM OF DOCUMENTS DELIVERED TO AGENT.

         In any case where several matters are required to be certified by, or
covered by an opinion of, any specified Person, it is not necessary that all
such matters be certified by, or covered by the

<PAGE>

opinion of, only one such Person, or that they be so certified or covered by
only one document, but one such Person may certify or give an opinion with
respect to some matters and one or more other such Persons as to other matters,
and any such Person may certify or give an opinion as to such matters in one or
several documents.

         Any certificate or opinion of an officer of the Company may be based,
insofar as it relates to legal matters, upon a certificate or opinion of, or
representations by, counsel, unless such officer knows, or in the exercise of
reasonable care should know, that the certificate or opinion or representations
with respect to the matters upon which his certificate or opinion is based are
erroneous. Any such certificate or Opinion of Counsel may be based, insofar as
it relates to factual matters, upon a certificate or opinion of, or
representations by, an officer or officers of the Company stating that the
information with respect to such factual matters is in the possession of the
Company unless such counsel knows, or in the exercise of reasonable care should
know, that the certificate or opinion or representations with respect to such
matters are erroneous.

         Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Agreement, they may, but need not, be consolidated and
form one instrument.

Section 1.4.      ACTS OF HOLDERS; RECORD DATES.

         (a) Any request, demand, authorization, direction, notice, consent,
waiver or other action provided by this Agreement to be given or taken by
Holders may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Holders in person or by an agent duly
appointed in writing; and, except as herein otherwise expressly provided, such
action shall become effective when such instrument or instruments are delivered
to the Agent and, where it is hereby expressly required, to the Company. Such
instrument or instruments (and the action embodied therein and evidenced
thereby) are herein sometimes referred to as the "Act" of the Holders signing
such instrument or instruments. Proof of execution of any such instrument or of
a writing appointing any such agent shall be sufficient for any purpose of this
Agreement and, subject to Section 7.1, conclusive in favor of the Agent and the
Company, if made in the manner provided in this Section.

         (b) The fact and date of the execution by any Person of any such
instrument or writing may be proved in any manner which the Agent deems
sufficient.

         (c) The ownership of Securities shall be proved by the Type A Units
Register or the Type B Units Register, as the case may be.

         (d) Any request, demand, authorization, direction, notice, consent,
waiver or other Act of the Holder of any Certificate shall bind every future
Holder of the same Certificate and the Holder of every Certificate issued upon
the registration of transfer thereof or in exchange therefor or in lieu thereof
in respect of anything done, omitted or suffered to be done by the Agent or the
Company in reliance thereon, whether or not notation of such action is made upon
such Certificate.

<PAGE>

         (e) The Company may set any day as a record date for the purpose of
determining the Holders of Outstanding Securities entitled to give, make or take
any request, demand, authorization, direction, notice, consent, waiver or other
action provided or permitted by this Agreement to be given, made or taken by
Holders of Securities. If any record date is set pursuant to this paragraph, the
Holders of the Outstanding Type A Units and the Outstanding Type B Units, as the
case may be, on such record date, and no other Holders, shall be entitled to
take the relevant action with respect to the Type A Units or the Type B Units,
as the case may be, whether or not such Holders remain Holders after such record
date; provided that no such action shall be effective hereunder unless taken on
or prior to the applicable Expiration Date by Holders of the requisite number of
Outstanding Securities on such record date. Nothing in this paragraph shall be
construed to prevent the Company from setting a new record date for any action
for which a record date has previously been set pursuant to this paragraph
(whereupon the record date previously set shall automatically and with no action
by any Person be cancelled and be of no effect), and nothing in this paragraph
shall be construed to render ineffective any action taken by Holders of the
requisite number of Outstanding Securities on the date such action is taken.
Promptly after any record date is set pursuant to this paragraph, the Company,
at its own expense, shall cause notice of such record date, the proposed action
by Holders and the applicable Expiration Date to be given to the Agent in
writing and to each Holder of Securities in the manner set forth in Section 1.6.

         With respect to any record date set pursuant to this Section, the
Company may designate any date as the "Expiration Date" and from time to time
may change the Expiration Date to any earlier or later day; provided that no
such change shall be effective unless notice of the proposed new Expiration Date
is given to the Agent in writing, and to each Holder of Securities in the manner
set forth in Section 1.6, on or prior to the existing Expiration Date. If an
Expiration Date is not designated with respect to any record date set pursuant
to this Section, the Company shall be deemed to have initially designated the
180th day after such record date as the Expiration Date with respect thereto,
subject to its right to change the Expiration Date as provided in this
paragraph. Notwithstanding the foregoing, no Expiration Date shall be later than
the 180th day after the applicable record date.

Section 1.5.      NOTICES.

         Any notice or communication is duly given if in writing and delivered
in Person or mailed by first class mail (registered or certified, return receipt
requested), telecopier (with receipt confirmed) or overnight air courier
guaranteeing next day delivery, to the others' address; provided that notice
shall be deemed given to the Agent only upon receipt thereof:

         If to the Agent:

                  Telecopier No.:
                  Attention:

<PAGE>

         If to the Company:

                  Telecopier No.:
                  Attention:

         If to the Collateral Agent:

                  Telecopier No.:
                  Attention:

         If to the Indenture Trustee:

                  Telecopier No.:
                  Attention:

Section 1.6.      NOTICE TO HOLDERS; WAIVER.

         Where this Agreement provides for notice to Holders of any event, such
notice shall be sufficiently given (unless otherwise herein expressly provided)
if in writing and mailed, first-class postage prepaid, to each Holder affected
by such event, at its address as it appears in the applicable Register, not
later than the latest date, and not earlier than the earliest date, prescribed
for the giving of such notice. In any case where notice to Holders is given by
mail, neither the failure to mail such notice, nor any defect in any notice so
mailed to any particular Holder shall affect the sufficiency of such notice with
respect to other Holders. Where this Agreement provides for notice in any
manner, such notice may be waived in writing by the Person entitled to receive
such notice, either before or after the event, and such waiver shall be the
equivalent of such notice. Waivers of notice by Holders shall be filed with the
Agent, but such filing shall not be a condition precedent to the validity of any
action taken in reliance upon such waiver.

         In case by reason of the suspension of regular mail service or by
reason of any other cause it shall be impracticable to give such notice by mail,
then such notification as shall be made with the approval of the Agent shall
constitute a sufficient notification for every purpose hereunder.

Section 1.7.      EFFECT OF HEADINGS AND TABLE OF CONTENTS.

         The Article and Section headings herein and the Table of Contents are
for convenience only and shall not affect the construction hereof.

<PAGE>

Section 1.8.      SUCCESSORS AND ASSIGNS.

         All covenants and agreements in this Agreement by the Company shall
bind its successors and assigns, whether so expressed or not.

Section 1.9.      SEPARABILITY CLAUSE.

         In case any provision in this Agreement or in the Securities shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions hereof and thereof shall not in any way be affected or
impaired thereby.

Section 1.10.     BENEFITS OF AGREEMENT.

         Nothing in this Agreement or in the Securities, express or implied,
shall give to any Person, other than the parties hereto and their successors
hereunder and, to the extent provided hereby, the Holders, any benefits or any
legal or equitable right, remedy or claim under this Agreement. The Holders from
time to time shall be beneficiaries of this Agreement and shall be bound by all
of the terms and conditions hereof and of the Securities evidenced by their
Certificates by their acceptance of delivery of such Certificates.

Section 1.11.     GOVERNING LAW.

         This Agreement and the Securities shall be governed by and construed in
accordance with the laws of the State of New York.

Section 1.12.     LEGAL HOLIDAYS.

         In any case where any Payment Date shall not be a Business Day, then
(notwithstanding any other provision of this Agreement or the Type A Unit
Certificates or the Type B Unit Certificates) payment of the Contract Adjustment
Payments, if any, shall not be made on such date, but such payments shall be
made on the next succeeding Business Day with the same force and effect as if
made on such Payment Date, provided that no interest shall accrue or be payable
by the Company or any Holder for the period from and after any such Payment
Date, except that, if such next succeeding Business Day is in the next
succeeding calendar year, such payment shall be made on the immediately
preceding Business Day with the same force and effect as if made on such Payment
Date.

         In any case where any Purchase Contract Settlement Date shall not be a
Business Day, then (notwithstanding any other provision of this Agreement, the
Type A Unit Certificates or the Type B Unit Certificates) Purchase Contracts
shall not be performed on such date, but the Purchase Contracts shall be
performed on the immediately following Business Day with the same force and
effect as if performed on the Purchase Contract Settlement Date.

<PAGE>

Section 1.13.     COUNTERPARTS.

         This Agreement may be executed in any number of counterparts by the
parties hereto on separate counterparts, each of which, when so executed and
delivered, shall be deemed an original, but all such counterparts shall together
constitute one and the same instrument.

Section 1.14.     INSPECTION OF AGREEMENT.

         A copy of this Agreement shall be available at all reasonable times
during normal business hours at the Corporate Trust Office for inspection by any
Holder or Beneficial Owner.

                                   ARTICLE II

                                Certificate Forms

Section 2.1.      FORMS OF CERTIFICATES GENERALLY.

         The Type A Unit Certificates (including the form of Purchase Contract
forming part of the Type A Units evidenced thereby) shall be in substantially
the form set forth in Exhibit A hereto, with such letters, numbers or other
marks of identification or designation and such legends or endorsements printed,
lithographed or engraved thereon as may be required by the rules of any
securities exchange on which the Type A Units are listed or any depositary
therefor, or as may, consistently herewith, be determined by the officers of the
Company executing such Type A Unit Certificates, as evidenced by their execution
of the Type A Unit Certificates.

         The definitive Type A Unit Certificates shall be printed, lithographed
or engraved on steel engraved borders or may be produced in any other manner,
all as determined by the officers of the Company executing the Type A Units
evidenced by such Type A Unit Certificates, consistent with the provisions of
this Agreement, as evidenced by their execution thereof.

         The Type B Unit Certificates (including the form of Purchase Contracts
forming part of the Type B Units evidenced thereby) shall be in substantially
the form set forth in Exhibit B hereto, with such letters, numbers or other
marks of identification or designation and such legends or endorsements printed,
lithographed or engraved thereon as may be required by the rules of any
securities exchange on which the Type B Units may be listed or any depositary
therefor, or as may, consistently herewith, be determined by the officers of the
Company executing such Type B Unit Certificates, as evidenced by their execution
of the Type B Unit Certificates.

         The definitive Type B Unit Certificates shall be printed, lithographed
or engraved on steel engraved borders or may be produced in any other manner,
all as determined by the officers of the Company executing the Type B Units
evidenced by such Type B Unit Certificates, consistent with the provisions of
this Agreement, as evidenced by their execution thereof.

<PAGE>

         Every Global Certificate authenticated, executed on behalf of the
Holders and delivered hereunder shall bear a legend in substantially the
following form:

         "THIS CERTIFICATE IS A GLOBAL CERTIFICATE WITHIN THE MEANING OF THE
         PURCHASE CONTRACT AGREEMENT HEREINAFTER REFERRED TO AND IS REGISTERED
         IN THE NAME OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION
         (THE "DEPOSITARY"), OR A NOMINEE OF THE DEPOSITARY. THIS CERTIFICATE IS
         EXCHANGEABLE FOR CERTIFICATES REGISTERED IN THE NAME OF A PERSON OTHER
         THAN THE DEPOSITARY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES
         DESCRIBED IN THE PURCHASE CONTRACT AGREEMENT AND NO TRANSFER OF THIS
         CERTIFICATE (OTHER THAN A TRANSFER OF THIS CERTIFICATE AS A WHOLE BY
         THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE
         DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY) MAY
         BE REGISTERED EXCEPT IN LIMITED CIRCUMSTANCES.

         UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF
         THE DEPOSITARY FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND
         ANY CERTIFICATE ISSUED IS REQUESTED IN THE NAME OF CEDE & CO. OR SUCH
         OTHER NAME AS REGISTERED BY AN AUTHORIZED REPRESENTATIVE OF THE
         DEPOSITARY (AND ANY PAYMENT HEREON IS MADE TO CEDE & CO. OR TO SUCH
         OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE
         DEPOSITARY), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
         OTHERWISE BY OR TO ANY PERSON IS WRONGFUL SINCE THE REGISTERED OWNER
         HEREOF, CEDE & CO., HAS AN INTEREST HEREIN."

Section 2.2.      FORM OF AGENT'S CERTIFICATE OF AUTHENTICATION.

         The form of the Agent's certificate of authentication of the Type A
Units shall be in substantially the form set forth on the form of the Type A
Unit Certificates.

         The form of the Agent's certificate of authentication of the Type B
Units shall be in substantially the form set forth on the form of the Type B
Unit Certificates.

<PAGE>

                                   ARTICLE III

                                 The Securities

Section 3.1.      AMOUNT; FORM AND DENOMINATIONS.

         The aggregate number of Securities evidenced by Certificates
authenticated, executed on behalf of the Holders and delivered hereunder is
limited to [__________] except for Certificates authenticated, executed and
delivered upon registration of transfer of, in exchange for, or in lieu of,
other Certificates pursuant to Section 3.4, 3.5, 3.10, 3.13, 3.14, 5.9 or 8.5.

         The Certificates shall be issuable only in registered form and only in
denominations of a single Type A Unit or Type B Unit and any integral multiple
thereof.

Section 3.2.      RIGHTS AND OBLIGATIONS EVIDENCED BY THE CERTIFICATES.

         Each Type A Unit Certificate shall evidence the number of Type A Units
specified therein, with each such Type A Unit representing the ownership by the
Holder thereof of a beneficial interest in a Debenture, subject to the Pledge of
such Debenture by such Holder pursuant to the Pledge Agreement, and the rights
and obligations of the Holder thereof and the Company under one Purchase
Contract. The Agent as attorney-in-fact for, and on behalf of, the Holder of
each Type A Unit shall pledge, pursuant to the Pledge Agreement, the Debenture,
forming a part of such Type A Unit, to the Collateral Agent and grant to the
Collateral Agent a security interest in the right, title and interest of such
Holder in such Debenture for the benefit of the Company, to secure the
obligation of the Holder under each Purchase Contract to purchase the Common
Stock of the Company. Prior to the purchase of shares of Common Stock under each
Purchase Contract, such Purchase Contracts shall not entitle the Holder of a
Type A Unit Certificate to any of the rights of a holder of shares of Common
Stock, including, without limitation, the right to vote or receive any dividends
or other payments or to consent or to receive notice as a stockholder in respect
of the meetings of stockholders or for the election of directors of the Company
or for any other matter, or any other rights whatsoever as a stockholder of the
Company.

         Each Type B Unit Certificate shall evidence the number of Type B Units
specified therein, with each such Type B Unit representing the ownership by the
Holder thereof of a 1/20 undivided beneficial interest in a Treasury Security
with a principal amount equal to $1,000, subject to the Pledge of such Treasury
Security by such Holder pursuant to the Pledge Agreement, and the rights and
obligations of the Holder thereof and the Company under one Purchase Contract.
Prior to the purchase, if any, of shares of Common Stock under each Purchase
Contract, such Purchase Contract shall not entitle the Holder of a Type B Unit
Certificate to any of the rights of a holder of shares of Common Stock,
including, without limitation, the right to vote or receive any dividends or
other payments or to consent or to receive notice as a stockholder in respect of
the meetings of stockholders or for the election of directors of the Company or
for any other matter, or any other rights whatsoever as a stockholder of the
Company.

<PAGE>

Section 3.3.      EXECUTION, AUTHENTICATION, DELIVERY AND DATING.

         Subject to the provisions of Sections 3.13 and 3.14 hereof, upon the
execution and delivery of this Agreement, and at any time and from time to time
thereafter, the Company may deliver Certificates executed by the Company to the
Agent for authentication, execution on behalf of the Holders and delivery,
together with its Issuer Order for authentication of such Certificates, and the
Agent in accordance with such Issuer Order shall authenticate, execute on behalf
of the Holders and deliver such Certificates.

         The Certificates shall be executed on behalf of the Company by its
Chairman of the Board, its President or one of its Vice Presidents. The
signature of any of these officers on the Certificates may be manual or
facsimile.

         Certificates bearing the manual or facsimile signatures of individuals
who were at any time the proper officers of the Company shall bind the Company,
notwithstanding that such individuals or any of them have ceased to hold such
offices prior to the authentication and delivery of such Certificates or did not
hold such offices at the date of such Certificates

         No Purchase Contract evidenced by a Certificate shall be valid until
such Certificate has been executed on behalf of the Holder by the manual
signature of an authorized signatory of the Agent, as such Holder's
attorney-in-fact. Such signature by an authorized signatory of the Agent shall
be conclusive evidence that the Holder of such Certificate has entered into the
Purchase Contracts evidenced by such Certificate.

         Each Certificate shall be dated the date of its authentication.

         No Certificate shall be entitled to any benefit under this Agreement or
be valid or obligatory for any purpose unless there appears on such Certificate
a certificate of authentication substantially in the form provided for herein
executed by an authorized signatory of the Agent by manual signature, and such
certificate upon any Certificate shall be conclusive evidence, and the only
evidence, that such Certificate has been duly authenticated and delivered
hereunder.

Section 3.4.      TEMPORARY CERTIFICATES.

         Pending the preparation of definitive Certificates, the Company shall
execute and deliver to the Agent, and the Agent shall authenticate, execute on
behalf of the Holders, and deliver, in lieu of such definitive Certificates,
temporary Certificates which are in substantially the form set forth in Exhibit
A or Exhibit B hereto, as the case may be, with such letters, numbers or other
marks of identification or designation and such legends or endorsements printed,
lithographed or engraved thereon as may be required by the rules of any
securities exchange on which the Type A Units or Type B Units are listed, or as
may, consistently herewith, be determined by the officers of the Company
executing such Certificates, as evidenced by their execution of the
Certificates.

         If temporary Certificates are issued, the Company will cause definitive
Certificates to be prepared without unreasonable delay. After the preparation of
definitive Certificates, the temporary Certificates shall be exchangeable for
definitive Certificates upon surrender of the

<PAGE>

temporary Certificates at the Corporate Trust Office, at the expense of the
Company and without charge to the Holder. Upon surrender for cancellation of any
one or more temporary Certificates, the Company shall execute and deliver to the
Agent, and the Agent shall authenticate, execute on behalf of the Holder, and
deliver in exchange therefor, one or more definitive Certificates of like tenor
and denominations and evidencing a like aggregate number of Type A Units or Type
B Units, as the case may be, as the temporary Certificate or Certificates so
surrendered. Until so exchanged, the temporary Certificates shall in all
respects evidence the same benefits and the same obligations with respect to the
Type A Units or Type B Units, as the case may be, evidenced thereby as
definitive Certificates.

Section 3.5.      REGISTRATION; REGISTRATION OF TRANSFER AND EXCHANGE.

         The Agent shall keep at the Corporate Trust Office a register (the
"Type A Units Register") in which, subject to such reasonable regulations as it
may prescribe, the Agent shall provide for the registration of Type A Unit
Certificates and of transfers of Type A Unit Certificates (the Agent, in such
capacity, the "Type A Units Registrar") and a register (the "Type B Units
Register") in which, subject to such reasonable regulations as it may prescribe,
the Agent shall provide for the registration of the Type B Unit Certificates and
transfers of Type B Unit Certificates (the Agent, in such capacity, the "Type B
Units Registrar").

         Upon surrender for registration of transfer of any Certificate at the
Corporate Trust Office, the Company shall execute and deliver to the Agent, and
the Agent shall authenticate, execute on behalf of the designated transferee or
transferees, and deliver, in the name of the designated transferee or
transferees, one or more new Certificates of any authorized denominations, like
tenor, and evidencing a like aggregate number of Type A Units or Type B Units,
as the case may be.

         At the option of the Holder, Certificates may be exchanged for other
Certificates, of any authorized denominations and evidencing a like number of
Type A Units or Type B Units, as the case may be, upon surrender of the
Certificates to be exchanged at the Corporate Trust Office. Whenever any
Certificates are so surrendered for exchange, the Company shall execute and
deliver to the Agent, and the Agent shall authenticate, execute on behalf of the
Holder, and deliver the Certificates which the Holder making the exchange is
entitled to receive.

         All Certificates issued upon any registration of transfer or exchange
of a Certificate shall evidence the ownership of the same aggregate number of
Type A Units or Type B Units, as the case may be, and be entitled to the same
benefits and subject to the same obligations, under this Agreement as the Type A
Units or Type B Units, as the case may be, evidenced by the Certificate
surrendered upon such registration of transfer or exchange.

         Every Certificate presented or surrendered for registration of transfer
or for exchange shall (if so required by the Agent) be duly endorsed, or be
accompanied by a written instrument of transfer in form satisfactory to the
Company and the Agent duly executed, by the Holder thereof or its attorney duly
authorized in writing.

<PAGE>

         No service charge shall be made for any registration of transfer or
exchange of a Certificate, but the Company and the Agent may require payment
from the Holder of a sum sufficient to cover any tax or other governmental
charge that may be imposed in connection with any registration of transfer or
exchange of Certificates, other than any exchanges pursuant to Sections 3.10 and
8.5 not involving any transfer.

         Notwithstanding the foregoing, the Company shall not be obligated to
execute and deliver to the Agent, and the Agent shall not be obligated to
authenticate, execute on behalf of the Holder and deliver any Certificate in
exchange for any other Certificate presented or surrendered for registration of
transfer or for exchange on or after the Business Day immediately preceding the
earlier of the Purchase Contract Settlement Date or the Termination Date. In
lieu of delivery of a new Certificate, upon satisfaction of the applicable
conditions specified above in this Section and receipt of appropriate
registration or transfer instructions from such Holder, the Agent shall (i) if
the Purchase Contract Settlement Date has occurred, deliver the shares of Common
Stock issuable in respect of the Purchase Contracts forming a part of the
Securities evidenced by such other Certificate or (ii) if a Termination Event
shall have occurred prior to the Purchase Contract Settlement Date, transfer the
Debentures or the Treasury Securities, as the case may be, evidenced thereby, in
each case subject to the applicable conditions and in accordance with the
applicable provisions of Article Five hereof.

Section 3.6.      BOOK-ENTRY INTERESTS.

         The Certificates, on original issuance, will be issued in the form of
one or more fully registered Global Certificates, to be delivered to the
Depositary by, or on behalf of, the Company. Such Global Certificate shall
initially be registered on the books and records of the Company in the name of
Cede & Co., the nominee of the Depositary, and no Beneficial Owner will receive
a definitive Certificate representing such Beneficial Owner's interest in such
Global Certificate, except as provided in Section 3.9. The Agent shall enter
into an agreement with the Depositary if so requested by the Company. Unless and
until definitive, fully registered Certificates have been issued to Beneficial
Owners pursuant to Section 3.9:

                  (a)  the provisions of this Section 3.6 shall be in full force
         and effect;

                  (b) the Company shall be entitled to deal with the Clearing
         Agency for all purposes of this Agreement (including the payment of
         Contract Adjustment Payments, if any, and receiving approvals, votes or
         consents hereunder) as the Holder of the Securities and the sole holder
         of the Global Certificate(s) and shall have no obligation to the
         Beneficial Owners;

                  (c) to the extent that the provisions of this Section 3.6
         conflict with any other provisions of this Agreement, the provisions of
         this Section 3.6 shall control; and

                  (d) the rights of the Beneficial Owners shall be exercised
         only through the Clearing Agency and shall be limited to those
         established by law and agreements between such Beneficial Owners and
         the Clearing Agency and/or the Clearing Agency Participants.

<PAGE>

Section 3.7.      NOTICES TO HOLDERS.

         Whenever a notice or other communication to the Holders is required to
be given under this Agreement, the Company or the Company's agent shall give
such notices and communications to the Holders and, with respect to any
Securities registered in the name of a Clearing Agency or the nominee of a
Clearing Agency, the Company or the Company's agent shall, except as set forth
herein, have no obligations to the Beneficial Owners.

Section 3.8.      APPOINTMENT OF SUCCESSOR CLEARING AGENCY.

         If any Clearing Agency elects to discontinue its services as securities
depositary with respect to the Securities, the Company may, in its sole
discretion, appoint a successor Clearing Agency with respect to the Securities.

Section 3.9.      DEFINITIVE CERTIFICATES.

         If (i) a Clearing Agency elects to discontinue its services as
securities depositary with respect to the Securities and a successor Clearing
Agency is not appointed within 90 days after such discontinuance pursuant to
Section 3.8 or (ii) there shall have occurred and be continuing a default by the
Company in respect of its obligations under one or more Purchase Contracts, then
upon surrender of the Global Certificates representing the Securities by the
Clearing Agency, accompanied by registration instructions, the Company shall
cause definitive Certificates to be delivered to Beneficial Owners in accordance
with the instructions of the Clearing Agency. The Company shall not be liable
for any delay in delivery of such instructions and may conclusively rely on and
shall be protected in relying on, such instructions.

Section 3.10.     MUTILATED, DESTROYED, LOST AND STOLEN CERTIFICATES.

         If any mutilated Certificate is surrendered to the Agent, the Company
shall execute and deliver to the Agent, and the Agent shall authenticate,
execute on behalf of the Holder, and deliver in exchange therefor, a new
Certificate, evidencing the same number of Type A Units or Type B Units, as the
case may be, and bearing a Certificate number not contemporaneously outstanding.

         If there shall be delivered to the Company and the Agent (i) evidence
to their satisfaction of the destruction, loss or theft of any Certificate, and
(ii) such security or indemnity as may be required by them to hold each of them
and any agent of any of them harmless, then, in the absence of notice to the
Company or the Agent that such Certificate has been acquired by a bona fide
purchaser, the Company shall execute and deliver to the Agent, and the Agent
shall authenticate, execute on behalf of the Holder, and deliver to the Holder,
in lieu of any such destroyed, lost or stolen Certificate, a new Certificate,
evidencing the same number of Type A Units or Type B Units, as the case may be,
and bearing a Certificate number not contemporaneously outstanding.

         Notwithstanding the foregoing, the Company shall not be obligated to
execute and deliver to the Agent, and the Agent shall not be obligated to
authenticate, execute on behalf of the

<PAGE>

Holder, and deliver to the Holder, a Certificate on or after the Business Day
immediately preceding the earlier of the Purchase Contract Settlement Date or
the Termination Date. In lieu of delivery of a new Certificate, upon
satisfaction of the applicable conditions specified above in this Section and
receipt of appropriate registration or transfer instructions from such Holder,
the Agent shall (i) if the Purchase Contract Settlement Date has occurred,
deliver the shares of Common Stock issuable in respect of the Purchase Contracts
forming a part of the Securities evidenced by such Certificate, or (ii) if a
Termination Event shall have occurred prior to the Purchase Contract Settlement
Date, transfer the Debentures or the Treasury Securities, as the case may be,
evidenced thereby, in each case subject to the applicable conditions and in
accordance with the applicable provisions of Article Five hereof.

         Upon the issuance of any new Certificate under this Section, the
Company and the Agent may require the payment by the Holder of a sum sufficient
to cover any tax or other governmental charge that may be imposed in relation
thereto and any other expenses (including the fees and expenses of the Agent)
connected therewith.

         Every new Certificate issued pursuant to this Section in lieu of any
destroyed, lost or stolen Certificate shall constitute an original additional
contractual obligation of the Company and of the Holder in respect of the
Security evidenced thereby, whether or not the destroyed, lost or stolen
Certificate (and the Securities evidenced thereby) shall be at any time
enforceable by anyone, and shall be entitled to all the benefits and be subject
to all the obligations of this Agreement equally and proportionately with any
and all other Certificates delivered hereunder.

         The provisions of this Section are exclusive and shall preclude (to the
extent lawful) all other rights and remedies with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Certificates.

Section 3.11.     PERSONS DEEMED OWNERS.

         Prior to due presentment of a Certificate for registration of transfer,
the Company and the Agent, and any agent of the Company or the Agent, may treat
the Person in whose name such Certificate is registered as the owner of the Type
A Units or Type B Units evidenced thereby, for the purpose of receiving interest
on the Debentures, receiving payments of Contract Adjustment Payments,
performance of the Purchase Contracts and for all other purposes whatsoever,
whether or not any interest on the Debentures or the Contract Adjustment
Payments payable in respect of the Purchase Contracts constituting a part of the
Type A Units or Type B Units evidenced thereby shall be overdue and
notwithstanding any notice to the contrary, and neither the Company nor the
Agent, nor any agent of the Company or the Agent, shall be affected by notice to
the contrary.

         Notwithstanding the foregoing, with respect to any Global Certificate,
nothing herein shall prevent the Company, the Agent or any agent of the Company
or the Agent, from giving effect to any written certification, proxy or other
authorization furnished by any Clearing Agency (or its nominee), as a Holder,
with respect to such Global Certificate or impair, as between such Clearing
Agency and owners of beneficial interests in such Global Certificate, the
operation of customary practices governing the exercise of rights of such
Clearing Agency (or its nominee) as Holder of such Global Certificate.

<PAGE>

Section 3.12.     CANCELLATION.

         All Certificates surrendered for delivery of shares of Common Stock on
or after the Purchase Contract Settlement Date, upon the transfer of Debentures
or Treasury Securities, as the case may be, after the occurrence of a
Termination Event or pursuant to an Early Settlement, or upon the registration
of a transfer or exchange of a Security, or a Collateral Substitution or the
re-establishment of a Type A Unit shall, if surrendered to any Person other than
the Agent, be delivered to the Agent and, if not already cancelled, shall be
promptly cancelled by it. The Company may at any time deliver to the Agent for
cancellation any Certificates previously authenticated, executed and delivered
hereunder which the Company may have acquired in any manner whatsoever, and all
Certificates so delivered shall, upon Issuer Order, be promptly cancelled by the
Agent. No Certificates shall be authenticated, executed on behalf of the Holder
and delivered in lieu of or in exchange for any Certificates cancelled as
provided in this Section, except as expressly permitted by this Agreement. All
cancelled Certificates held by the Agent shall be destroyed by the Agent unless
otherwise directed by Issuer Order.

         If the Company or any Affiliate of the Company shall acquire any
Certificate, such acquisition shall not operate as a cancellation of such
Certificate unless and until such Certificate is delivered to the Agent
cancelled or for cancellation.

Section 3.13.     SUBSTITUTION OF SECURITIES.

         A Holder may separate the Debentures from the related Purchase
Contracts in respect of a Type A Unit by substituting, for such Debentures,
Treasury Securities in an aggregate principal amount equal to the aggregate
principal amount of such Debentures (a "Collateral Substitution"), at any time
from and after the date of this Agreement and on or prior to the seventh
Business Day immediately preceding the Purchase Contract Settlement Date by (a)
depositing with the Securities Intermediary Treasury Securities or securities
entitlements thereto having an aggregate principal amount equal to the aggregate
principal amount of the Debentures comprising part of such Type A Units and (b)
transferring the related Type A Units to the Agent accompanied by a notice to
the Agent, substantially in the form of Exhibit C hereto, stating that the
Holder has transferred the relevant amount of Treasury Securities to the
Securities Intermediary and requesting that the Agent instruct the Collateral
Agent to release the Debentures underlying such Type A Units, whereupon the
Agent shall promptly give such instruction to the Collateral Agent,
substantially in the form of Exhibit A to the Pledge Agreement. Upon receipt of
the Treasury Securities described in clause (a) above and the instruction
described in clause (b) above, in accordance with the terms of the Pledge
Agreement, the Collateral Agent will cause the Securities Intermediary to
release from the Pledge to the Agent, on behalf of the Holder, Debentures having
a corresponding aggregate principal amount, free and clear of the Company's
security interest therein, and upon receipt thereof the Agent shall promptly:

                         (i)  cancel the related Type A Units;

                        (ii)  transfer the Debentures to the Holder; and

<PAGE>

                       (iii)  authenticate, execute on behalf of such Holder and
         deliver a Type B Unit Certificate executed by the Company in accordance
         with Section 3.3 evidencing the same number of Purchase Contracts as
         were evidenced by the cancelled Type A Units.

         Holders who elect to separate the Debentures from the related Purchase
Contract and to substitute Treasury Securities for such Debentures shall be
responsible for any fees or expenses payable to the Collateral Agent for its
services as Collateral Agent in respect of the substitution, and the Company
shall not be responsible for any such fees or expenses.

         Holders may make Collateral Substitutions only in integral multiples of
20 Type A Units if Treasury Securities are being substituted for Debentures.

         In the event a Holder making a Collateral Substitution pursuant to this
Section 3.13 fails to effect a book-entry transfer of the Type A Unit or fails
to deliver a Type A Unit Certificate(s) to the Agent after depositing Treasury
Securities with the Collateral Agent, the Debentures, constituting a part of
such Type A Unit, and any interest on such Debentures, shall be held in the name
of the Agent or its nominee in trust for the benefit of such Holder, until such
Type A Unit is so transferred or the Type A Unit Certificate is so delivered, as
the case may be, or, with respect to a Type A Unit Certificate, such Holder
provides evidence satisfactory to the Company and the Agent that such Type A
Unit Certificate has been destroyed, lost or stolen, together with any indemnity
that may be required by the Agent and the Company.

         Except as described in this Section 3.13, for so long as the Purchase
Contract underlying a Type A Unit remains in effect, such Type A Unit shall not
be separable into its constituent parts, and the rights and obligations of the
Holder in respect of the Debentures and the Purchase Contract comprising such
Type A Unit may be acquired, and may be transferred and exchanged, only as a
Type A Unit.

Section 3.14.     REESTABLISHMENT OF TYPE A UNITS.

         A Holder of a Type B Unit may recreate Type A Unit at any time on or
prior to the seventh Business Day immediately preceding the Purchase Contract
Settlement Date by (a) depositing with the Securities Intermediary Debentures or
security entitlements thereto having an aggregate principal amount equal to the
aggregate principal amount at maturity of the Treasury Securities comprising
part of the Type B Units and (b) transferring the related Type B Units to the
Agent accompanied by a notice to the Agent, substantially in the form of Exhibit
C hereto, stating that the Holder has transferred the relevant amount of
Debentures to the Securities Intermediary and requesting that the Agent instruct
the Collateral Agent to release the Treasury Securities underlying such Type B
Units, whereupon the Agent shall promptly give such instruction to the
Collateral Agent, substantially in the form of Exhibit C to the Pledge
Agreement. Upon receipt of the Debentures described in clause (a) above and the
instruction described in clause (b) above, in accordance with the terms of the
Pledge Agreement, the Collateral Agent will cause the Securities Intermediary to
effect the release of the Treasury Securities having a corresponding aggregate
principal amount at maturity from the Pledge to the Agent free and clear of the
Company's security interest therein, and upon receipt thereof the Agent shall
promptly:

<PAGE>

                         (i)  cancel the related Type B Units;

                        (ii)  transfer the Treasury Securities to the Holder;
         and

                       (iii)  authenticate, execute on behalf of such Holder and
         deliver a Type A Unit Certificate executed by the Company in accordance
         with Section 3.3 evidencing the same number of Purchase Contracts as
         were evidenced by the cancelled Type B Units.

         Holders who elect to recreate Type A Units shall be responsible for any
fees or expenses payable to the Collateral Agent for its services as Collateral
Agent in respect of the substitution, and the Company shall not be responsible
for any such fees or expenses.

         Holders of Type B Units may reestablish Type A Units in integral
multiples of 20 Type B Units for 20 Type A Units.

         Except as provided in this Section 3.14, for so long as the Purchase
Contract underlying a Type B Unit remains in effect, such Type B Unit shall not
be separable into its constituent parts and the rights and obligations of the
Holder of such Type B Unit in respect of the 1/20 of a Treasury Security and the
Purchase Contract comprising such Type B Unit may be acquired, and may be
transferred and exchanged, only as a Type B Unit.

Section 3.15.     TRANSFER OF COLLATERAL UPON OCCURRENCE OF TERMINATION EVENT.

         Upon the occurrence of a Termination Event and the transfer to the
Agent of the Debentures or the Treasury Securities, as the case may be,
underlying the Type A Units and the Type B Units pursuant to the terms of the
Pledge Agreement, the Agent shall request transfer instructions with respect to
such Debentures or Treasury Securities, as the case may be, from each Holder by
written request, substantially in the form of Exhibit D hereto, mailed to such
Holder at its address as it appears in the Type A Units Register or the Type B
Units Register, as the case may be. Upon book-entry transfer of the Type A Units
or Type B Units or delivery of a Type A Unit Certificate or Type B Unit
Certificate to the Agent with such transfer instructions, the Agent shall
transfer the Debentures or Treasury Securities, as the case may be, underlying
such Type A Units or Type B Units, as the case may be, to such Holder by
book-entry transfer, or other appropriate procedures, in accordance with such
instructions. In the event a Holder of Type A Units or Type B Units fails to
effect such transfer or delivery, the Debentures or Treasury Securities, as the
case may be, underlying such Type A Units or Type B Units, as the case may be,
and any interest thereon, shall be held in the name of the Agent or its nominee
in trust for the benefit of such Holder, until the earlier of (a) transfer of
such Type A Units or Type B Units or surrender of the Type A Unit Certificate or
Type B Unit Certificate or such Holder provides satisfactory evidence that such
Type A Unit Certificate or Type B Unit Certificate has been destroyed, lost or
stolen, together with any indemnity that may be required by the Agent and the
Company and (b) the expiration of the time period specified in the abandoned
property laws of the relevant State.

<PAGE>

Section 3.16.     NO CONSENT TO ASSUMPTION.

         Each Holder of a Security, by acceptance thereof, shall be deemed
expressly to have withheld any consent to the assumption under Section 365 of
the Bankruptcy Code or otherwise, of the Purchase Contract by the Company or its
trustee, receiver, liquidator or a person or entity performing similar functions
in the event that the Company becomes the debtor under the Bankruptcy Code or
subject to other similar state or federal law providing for reorganization or
liquidation.

                                   ARTICLE IV

                                 The Debentures

Section 4.1.      PAYMENT OF INTEREST; RIGHTS TO INTEREST PRESERVED; INTEREST
                  RATE RESET.

         Interest on any Debenture which is paid on any Payment Date shall,
subject to receipt thereof by the Agent from the Collateral Agent as provided by
the terms of the Pledge Agreement, be paid to the Person in whose name the Type
A Unit Certificate (or one or more Predecessor Type A Unit Certificates) of
which such Debenture is a part is registered at the close of business on the
Record Date for such Payment Date.

         Each Type A Unit Certificate evidencing Debentures delivered under this
Agreement upon registration of transfer of or in exchange for or in lieu of any
other Type A Unit Certificate shall carry the rights to accrued and unpaid
interest, and to accrue interest, which were carried by the Debentures
underlying such other Type A Unit Certificate.

         In the case of any Type A Unit with respect to which Cash Settlement of
the underlying Purchase Contract is effected on or prior to the fifth Business
Day immediately preceding the Purchase Contract Settlement Date pursuant to
prior notice, or with respect to which Early Settlement of the underlying
Purchase Contract is effected on an Early Settlement Date, or with respect to
which a Collateral Substitution is effected, in each case on a date that is
after any Record Date and on or prior to the next succeeding Payment Date,
interest on the Debentures underlying such Type A Units otherwise payable on
such Payment Date shall be payable on such Payment Date notwithstanding such
Cash Settlement or Early Settlement or Collateral Substitution, and such
interest shall, subject to receipt thereof by the Agent, be payable to the
Person in whose name the Type A Unit Certificate (or one or more Predecessor
Type A Unit Certificates) was registered at the close of business on the Record
Date. Except as otherwise expressly provided in the immediately preceding
sentence, in the case of any Type A Unit with respect to which Cash Settlement
or Early Settlement of the underlying Purchase Contract is effected on or prior
to the fifth Business Day immediately preceding the Purchase Contract Settlement
Date or an Early Settlement Date, as the case may be, or with respect to which a
Collateral Substitution has been effected, interest on the related Debentures
that would otherwise be payable after the Purchase Contract Settlement Date or
Early Settlement Date shall not be payable hereunder to the Holder of such Type
A Unit; PROVIDED, HOWEVER, that to the extent that such Holder continues to hold
the separated Debentures that formerly comprised a part of such

<PAGE>

Holder's Type A Unit, such Holder shall be entitled to receive the interest on
such separated Debentures pursuant to their terms.

         The applicable interest rate borne by the Debentures on and after the
Purchase Contract Settlement Date shall be established pursuant to the
Remarketing on the third Business Day immediately preceding the Purchase
Contract Settlement Date to equal to the Reset Rate (such Reset Rate to be in
effect on and after the Purchase Contract Settlement Date).

Section 4.2.      NOTICE AND VOTING.

         Under the terms of the Pledge Agreement, the Agent will be entitled to
exercise the voting and any other consensual rights pertaining to the Pledged
Debentures, as the case may be, but only to the extent instructed in writing by
the Holders as described below. Upon receipt of notice of any meeting at which
holders of Debentures are entitled to vote or upon any solicitation of consents,
waivers or proxies of holders of Debentures, the Agent shall, as soon as
practicable thereafter, mail to the Holders of Type A Units a notice (a)
containing such information as is contained in the notice or solicitation, (b)
stating that each Holder on the record date set by the Agent therefor (which, to
the extent possible, shall be the same date as the record date for determining
the holders of Debentures, as the case may be, entitled to vote) shall be
entitled to instruct the Agent as to the exercise of the voting rights
pertaining to such Debentures underlying their Type A Units and (c) stating the
manner in which such instructions may be given. Upon the written request of the
Holders of Type A Units on such record date received by the Agent at least six
days prior to such meeting, the Agent shall endeavor insofar as practicable to
vote or cause to be voted, in accordance with the instructions set forth in such
requests, the maximum principal amount of Debentures as to which any particular
voting instructions are received. In the absence of specific instructions from
the Holder of a Type A Unit, the Agent shall abstain from voting the Debentures
underlying such Type A Unit. The Company hereby agrees, if applicable, to
solicit Holders of Type A Units to timely instruct the Agent in order to enable
the Agent to vote such Debentures.

                                    ARTICLE V

                             The Purchase Contracts

Section 5.1.      PURCHASE OF SHARES OF COMMON STOCK.

         Each Purchase Contract shall, unless an Early Settlement has occurred
in accordance with Section 5.9 hereof, obligate the Holder of the related
Security to purchase, and the Company to sell, on the Purchase Contract
Settlement Date at a price equal to the Stated Amount (the "Purchase Price"), a
number of newly issued shares of Common Stock equal to the Settlement Rate
unless, on or prior to the Purchase Contract Settlement Date, there shall have
occurred a Termination Event with respect to the Security of which such Purchase
Contract is a part. The "Settlement Rate" is equal to (a) if the Applicable
Market Value (as defined below) is equal to or greater than $[_______] (the
"Threshold Appreciation Price"), [_______] shares of Common Stock per Purchase
Contract, (b) if the Applicable Market Value is less than the Threshold

<PAGE>

Appreciation Price, but is greater than $[_______], the number of shares of
Common Stock equal to the Stated Amount divided by the Applicable Market Value
and (c) if the Applicable Market Value is less than or equal to $[_______],
[_______] shares of Common Stock per Purchase Contract, in each case subject to
adjustment as provided in Section 5.6 (and in each case rounded upward or
downward to the nearest 1/10,000th of a share). As provided in Section 5.10, no
fractional shares of Common Stock will be issued upon settlement of Purchase
Contracts.

         The "Applicable Market Value" means the average of the Closing Price
per share of Common Stock on each of the 20 Trading Days ending on the third
Trading Day immediately preceding the Purchase Contract Settlement Date. The
"Closing Price" of the Common Stock on any date of determination means (i) the
closing sale price (or, if no closing price is reported, the last reported sale
price) of the Common Stock on the New York Stock Exchange (the "NYSE") on such
date, (ii) if the Common Stock is not listed for trading on the NYSE on any such
date, the closing sale price as reported in the composite transactions for the
principal United States securities exchange on which the Common Stock is so
listed, (iii) if the Common Stock is not so listed on a United States national
or regional securities exchange, the closing sale price as reported by The
Nasdaq Stock Market, (iv) if the Common Stock is not so reported, the last
quoted bid price for the Common Stock in the over-the-counter market as reported
by the National Quotation Bureau or similar organization, or (v) if such bid
price is not available, the average of the mid-point of the last bid and ask
prices of the Common Stock on such date from at least three nationally
recognized independent investment banking firms retained for this purpose by the
Company. A "Trading Day" means a day on which the Common Stock (A) is not
suspended from trading on any national or regional securities exchange or
association or over-the-counter market at the close of business and (B) has
traded at least once on the national or regional securities exchange or
association or over-the-counter market that is the primary market for the
trading of the Common Stock.

         Each Holder of a Type A Unit or a Type B Unit, by its acceptance
thereof, irrevocably authorizes the Agent to enter into and perform the related
Purchase Contract on its behalf as its attorney-in-fact (including the execution
of Certificates on behalf of such Holder), agrees to be bound by the terms and
provisions thereof, covenants and agrees to perform its obligations under such
Purchase Contracts, and consents to the provisions hereof, irrevocably
authorizes the Agent as its attorney-in-fact to enter into and perform this
Agreement and the Pledge Agreement on its behalf as its attorney-in-fact, and
consents to and agrees to be bound by the Pledge of the Debentures or the
Treasury Securities pursuant to the Pledge Agreement; PROVIDED that upon a
Termination Event, the rights of the Holder of such Security under the Purchase
Contract may be enforced without regard to any other rights or obligations. Each
Holder of a Type A Unit or a Type B Unit, by its acceptance thereof, further
covenants and agrees, that to the extent and in the manner provided in Section
5.4 and the Pledge Agreement, but subject to the terms thereof, Proceeds from
the remarketing of the Debentures or the Proceeds of the Treasury Securities on
the Purchase Contract Settlement Date shall be paid by the Collateral Agent to
the Company in satisfaction of such Holder's obligations under such Purchase
Contract and such Holder shall acquire no right, title or interest in such
payments.

         Upon registration of transfer of a Certificate, the transferee shall be
bound (without the necessity of any other action on the part of such transferee)
by the terms of this Agreement, the

<PAGE>

Purchase Contracts underlying such Certificate and the Pledge Agreement and the
transferor shall be released from the obligations under this Agreement, the
Purchase Contracts underlying the Certificates so transferred and the Pledge
Agreement. The Company covenants and agrees, and each Holder of a Certificate,
by its acceptance thereof, likewise covenants and agrees, to be bound by the
provisions of this paragraph.

Section 5.2.      CONTRACT ADJUSTMENT PAYMENTS.

         The Company shall pay, on each Payment Date, the Contract Adjustment
Payments payable in respect of each Purchase Contract to the Person in whose
name a Certificate (or one or more Predecessor Certificates) is registered at
the close of business on the Record Date next preceding such Payment Date. The
Contract Adjustment Payments will be payable at the office of the Agent in The
City of New York maintained for that purpose or, at the option of the Company,
by check mailed to the address of the Person entitled thereto at such Person's
address as it appears on the Type A Units Register or Type B Units Register.

         Upon the occurrence of a Termination Event, the Company's obligation to
pay Contract Adjustment Payments (including any accrued Contract Adjustment
Payments) shall cease.

         Each Certificate delivered under this Agreement upon registration of
transfer of or in exchange for or in lieu of (including as a result of a
Collateral Substitution or the re-establishment of a Type A Unit) any other
Certificate shall carry the rights to Contract Adjustment Payments accrued and
unpaid, and to accrue Contract Adjustment Payments, which were carried by the
Purchase Contracts underlying such other Certificates.

         Subject to Section 5.9, in the case of any Security with respect to
which Early Settlement of the underlying Purchase Contract is effected on an
Early Settlement Date that is after any Record Date and on or prior to the next
succeeding Payment Date, Contract Adjustment Payments, if any, otherwise payable
on such Payment Date shall be payable on such Payment Date notwithstanding such
Early Settlement, and such Contract Adjustment Payments shall be paid to the
Person in whose name the Certificate evidencing such Security (or one or more
Predecessor Certificates) is registered at the close of business on such Record
Date. Except as otherwise expressly provided in the immediately preceding
sentence, in the case of any Security with respect to which Early Settlement of
the underlying Purchase Contract is effected on an Early Settlement Date,
Contract Adjustment Payments that would otherwise be payable after the Early
Settlement Date with respect to such Purchase Contract shall not be payable.

Section 5.3.      [INTENTIONALLY OMITTED].

Section 5.4.      PAYMENT OF PURCHASE PRICE.

         (a) (i) Unless a Holder settles the underlying Purchase Contract
through the early delivery of cash to the Purchase Contract Agent in the manner
described in Section 5.9, each Holder of a Type A Unit who intends to pay in
cash to satisfy such Holder's obligation under the Purchase Contract shall
notify the Agent by use of a notice in substantially the form of Exhibit E
hereto of its intention to pay in cash ("Cash Settlement") the Purchase Price
for the shares of Common

<PAGE>

Stock to be purchased pursuant to a Purchase Contract. Such notice shall be
given prior to 5:00 p.m., New York City time, on the seventh Business Day
immediately preceding the Purchase Contract Settlement Date. Prior to 11:00
a.m., New York City time, on the next succeeding Business Day, the Agent shall
notify the Collateral Agent and the Indenture Trustee of the receipt of such
notices from Holders intending to make a Cash Settlement.

               (ii) A Holder of a Type A Unit who has so notified the Agent of
its intention to make a Cash Settlement shall pay the Purchase Price to the
Securities Intermediary for deposit in the Collateral Account prior to 11:00
a.m., New York City time, on the fifth Business Day immediately preceding the
Purchase Contract Settlement Date in lawful money of the United States by
certified or cashiers' check or wire transfer, in each case in immediately
available funds payable to or upon the order of the Securities Intermediary. Any
cash received by the Collateral Agent shall be invested promptly by the
Securities Intermediary in Permitted Investments and paid to the Company on the
Purchase Contract Settlement Date in settlement of the Purchase Contract in
accordance with the terms of this Agreement and the Pledge Agreement. Any funds
received by the Securities Intermediary in respect of the investment earnings
from the investment in such Permitted Investments, shall be distributed to the
Agent when received for payment to the Holder of the related Type A Units on the
Purchase Contract Settlement Date.

              (iii) If a Holder of a Type A Unit fails to notify the Agent of
its intention to make a Cash Settlement in accordance with paragraph (a)(i)
above, or does notify the Agent as provided in paragraph (a)(i) above of its
intention to pay the Purchase Price in cash, but fails to make such payment as
required by paragraph (a)(ii) above, such Holder shall be deemed to have
consented to the disposition of the Pledged Debentures pursuant to the
remarketing as described in paragraph (b) below.

               (iv) Not later than 15 calendar days nor more than 30 calendar
days prior to the third Business Day immediately preceding the Purchase Contract
Settlement Date, the Company shall request DTC (or any successor Clearing
Agency), to notify the Beneficial Owners or Clearing Agency Participants holding
Type A Units or Type B Units of the procedures to be followed by Holders of Type
A Units who intend to effect the settlement of their obligations under the
Purchase Contracts underlying such Type A Units with separate cash on or prior
to the fifth Business Day prior to the Purchase Contract Settlement Date.

                (v) Promptly after 11:00 a.m., New York City time, on the fifth
Business Day preceding the Purchase Contract Settlement Date, the Agent, based
on notices received by the Agent pursuant to Section 5.4(a)(i) hereof and notice
from the Securities Intermediary regarding cash received by it prior to such
time, shall notify the Collateral Agent and the Indenture Trustee of the
principal amount of Debentures to be tendered for purchase in the Remarketing in
a notice substantially in the form of Exhibit F hereto.

         (b) In order to dispose of the Debentures, Type A Unit Holders who have
not notified the Agent of their intention to effect a Cash Settlement as
provided in paragraph (a)(i) above, or who have so notified the Agent but fail
to make such payment as required by paragraph (a)(ii) above, the Company shall
engage _____________ (the "Remarketing Agent") pursuant to the Remarketing
Agreement to sell such Debentures. In order to facilitate the remarketing, the

<PAGE>

Agent, based on the notices specified in Section 5.4(a)(v), shall notify the
Remarketing Agent, promptly after 11:00 a.m., New York City time, on the fifth
Business Day immediately preceding the Purchase Contract Settlement Date, of the
aggregate principal amount of Debentures that are a component of Type A Units to
be remarketed. Concurrently, the Collateral Agent, pursuant to the terms of the
Pledge Agreement, shall cause such Debentures to be presented to the Remarketing
Agent for remarketing. Upon receipt of such notice from the Agent and such
Debentures, the Remarketing Agent shall, on the third Business Day immediately
preceding the Purchase Contract Settlement Date, use commercially reasonable
efforts to remarket such Debentures on such date at a price of 100.25% of the
aggregate principal amount at maturity of such Debentures. The proceeds equal to
100% of the aggregate principal amount at maturity of the remarketed Debentures
shall automatically be applied by the Collateral Agent, in accordance with the
Pledge Agreement, to satisfy in full such Type A Unit Holders' obligations to
pay the Purchase Price for the Common Stock under the related Purchase Contracts
on the Purchase Contract Settlement Date. The proceeds equal to .25% of the
aggregate principal amount at maturity of the remarketed Debentures shall
automatically be applied, in accordance with the Pledge Agreement, to pay the
remarketing fee of the Remarketing Agent. Type A Unit Holders whose Debentures
are so remarketed shall not be responsible for the payment of any remarketing
fee in connection therewith. If, in spite of using their reasonable efforts, the
Remarketing Agent cannot remarket the related Debentures of such Holders of Type
A Units at a price of 100.25% of the aggregate principal amount at maturity of
such Debentures, the remarketing shall be deemed to have failed (a "Failed
Remarketing") and in accordance with the terms of the Pledge Agreement the
Collateral Agent, for the benefit of the Company, shall be entitled to exercise
its rights as a secured party with respect to such Debentures, including those
actions specified in paragraph (c) below; provided, that if upon a Failed
Remarketing the Collateral Agent exercises such rights for the benefit of the
Company with respect to such Debentures, any accrued and unpaid interest on such
Debentures shall become payable by the Company to the Agent for payment to the
Beneficial Owner of the Type A Units to which such Debentures relate. The
Company shall cause a notice of such Failed Remarketing to be published no later
than the Business Day immediately preceding the Purchase Contract Settlement
Date in a daily newspaper in the English language of general circulation in The
City of New York, which is expected to be THE WALL STREET JOURNAL.

         (c) With respect to any Debentures which are subject to a Failed
Remarketing, the Collateral Agent for the benefit of the Company reserves all of
its rights as a secured party with respect thereto and, subject to applicable
law and paragraph (g) below, may, among other things, (i) retain the Debentures
in full satisfaction of the Holders' obligations under the Purchase Contracts or
(ii) sell the Debentures in one or more public or private sales.

         (d) (i) Unless a Holder of Type B Units settles the underlying Purchase
Contract through the early delivery of cash to the Purchase Contract Agent in
the manner described in Section 5.9, each Holder of a Type B Unit who intends to
pay in cash shall notify the Agent by use of a notice in substantially the form
of Exhibit E hereto of its intention to pay in cash the Purchase Price for the
shares of Common Stock to be purchased pursuant to a Purchase Contract. Such
notice shall be given on or prior to 5:00 p.m., New York City time, on the
second Business Day immediately preceding the Purchase Contract Settlement Date.

<PAGE>

               (ii)  A Holder of a Type B Unit who has so notified the Agent of
its intention to make a Cash Settlement in accordance with paragraph (d)(i)
above shall pay the Purchase Price to the Securities Intermediary for deposit in
the Collateral Account prior to 11:00 a.m., New York City time, on the Business
Day immediately preceding the Purchase Contract Settlement Date in lawful money
of the United States by certified or cashiers' check or wire transfer, in each
case in immediately available funds payable to or upon the order of the
Securities Intermediary. Any cash received by the Collateral Agent shall be
invested promptly by the Securities Intermediary in Permitted Investments and
paid to the Company on the Purchase Contract Settlement Date in settlement of
the Purchase Contract in accordance with the terms of this Agreement and the
Pledge Agreement. Any funds received by the Securities Intermediary in respect
of the investment earnings from the investment in such Permitted Investments
shall be distributed to the Agent when received for payment to the Holder.

              (iii)  If a Holder of a Type B Unit fails to notify the Agent of
its intention to make a Cash Settlement in accordance with paragraph (d)(i)
above, or does notify the Agent as provided in paragraph (d)(i) above of its
intention to pay the Purchase Price in cash, but fails to make such payment as
required by paragraph (d)(ii) above, then upon the maturity of the Pledged
Treasury Securities held by the Securities Intermediary on the Business Day
immediately prior to the Purchase Contract Settlement Date, the principal amount
of the Treasury Securities received by the Securities Intermediary shall be
invested promptly in Permitted Investments. On the Purchase Contract Settlement
Date an amount equal to the Purchase Price shall be remitted to the Company as
payment thereof without receiving any instructions from the Holder. In the event
the sum of the proceeds from the related Pledged Treasury Securities and the
investment earnings earned from such investments is in excess of the aggregate
Purchase Price of the Purchase Contracts being settled thereby, the Collateral
Agent shall cause the Securities Intermediary to distribute such excess to the
Agent for the benefit of the Holder of the related Type B Unit when received.

         (e) Any distribution to Holders of excess funds and interest described
above shall be payable at the office of the Agent in The City of New York
maintained for that purpose or, at the option of the Holder, by check mailed to
the address of the Person entitled thereto at such address as it appears on the
Register.

         (f) Upon Cash Settlement of any Purchase Contract, (i) the Collateral
Agent will in accordance with the terms of the Pledge Agreement cause the
Pledged Debentures or the Pledged Treasury Securities, as the case may be,
underlying the relevant Security to be released from the Pledge free and clear
of any security interest of the Company and transferred to the Agent for
delivery to the Holder thereof or its designee as soon as practicable and (ii)
subject to the receipt thereof, the Agent shall, by book-entry transfer, or
other appropriate procedures, in accordance with written instructions provided
by the Holder thereof, transfer such Debentures or such Treasury Securities, as
the case may be (or, if no such instructions are given to the Agent by the
Holder, the Agent shall hold such Debentures or such Treasury Securities, as the
case may be, and any interest thereon, in the name of the Agent or its nominee
in trust for the benefit of such Holder until the expiration of the time period
specified in the abandoned property laws of the relevant State).

<PAGE>

         (g) The obligations of the Holders to pay the Purchase Price are
non-recourse obligations and, except to the extent paid by Early Settlement or
Cash Settlement, are payable solely out of the proceeds of any Collateral
pledged to secure the obligations of the Holders and in no event will Holders be
liable for any deficiency between the proceeds of the disposition of Collateral
and the Purchase Price.

Section 5.5.      ISSUANCE OF SHARES OF COMMON STOCK.

         Unless a Termination Event or an Early Settlement shall have occurred,
subject to Section 5.6(b), the Company shall issue and deposit with the Agent,
for the benefit of the Holders of the Outstanding Securities, one or more
certificates representing the newly issued shares of Common Stock registered in
the name of the Agent (or its nominee) as custodian for the Holders (such
certificates for shares of Common Stock, together with any dividends or
distributions for which a record date and payment date for such dividend or
distribution has occurred after the Purchase Contract Settlement Date, being
hereinafter referred to as the "Purchase Contract Settlement Fund") to which the
Holders are entitled hereunder. Subject to the foregoing, upon surrender of a
Certificate to the Agent on or after the Purchase Contract Settlement Date,
together with settlement instructions thereon duly completed and executed, the
Holder of such Certificate shall be entitled to receive in exchange therefor a
certificate representing that number of whole shares of Common Stock which such
Holder is entitled to receive pursuant to the provisions of this Article Five
(after taking into account all Securities then held by such Holder), together
with cash in lieu of fractional shares as provided in Section 5.10 and any
dividends or distributions with respect to such shares constituting part of the
Purchase Contract Settlement Fund, but without any interest thereon, and the
Certificate so surrendered shall forthwith be cancelled. Such shares shall be
registered in the name of the Holder or the Holder's designee as specified in
the settlement instructions provided by the Holder to the Agent. If any shares
of Common Stock issued in respect of a Purchase Contract are to be registered to
a Person other than the Person in whose name the Certificate evidencing such
Purchase Contract is registered, no such registration shall be made unless the
Person requesting such registration has paid any transfer and other taxes
required by reason of such registration in a name other than that of the
registered Holder of the Certificate evidencing such Purchase Contract or has
established to the satisfaction of the Company that such tax either has been
paid or is not payable.

Section 5.6.      ADJUSTMENT OF SETTLEMENT RATE.

         (a)      Adjustments for Dividends, Distributions, Stock Splits, Etc.

                  (1) In case the Company shall pay or make a dividend or other
distribution on the Common Stock in Common Stock, the Settlement Rate in effect
at the opening of business on the day following the date fixed for the
determination of stockholders entitled to receive such dividend or other
distribution shall be increased by dividing such Settlement Rate by a fraction
of which the numerator shall be the number of shares of Common Stock outstanding
at the close of business on the date fixed for such determination and the
denominator shall be the sum of such number of shares and the total number of
shares constituting such dividend or other distribution, such increase to become
effective immediately after the opening of business on the day following the
date fixed for such determination. For the purposes of this paragraph (1), the
number of

<PAGE>

shares of Common Stock at any time outstanding shall not include shares held in
the treasury of the Company but shall include any shares issuable in respect of
any scrip certificates issued in lieu of fractions of shares of Common Stock.
The Company will not pay any dividend or make any distribution on shares of
Common Stock held in the treasury of the Company.

                  (2) In case the Company shall issue rights, options or
warrants to all holders of its Common Stock (not being available on an
equivalent basis to Holders of the Securities upon settlement of the Purchase
Contracts underlying such Securities) entitling them, for a period expiring
within 45 days after the record date for the determination of stockholders
entitled to receive such rights, options or warrants, to subscribe for or
purchase shares of Common Stock at a price per share less than the Current
Market Price per share of the Common Stock on the date fixed for the
determination of stockholders entitled to receive such rights, options or
warrants (other than pursuant to a dividend reinvestment plan), the Settlement
Rate in effect at the opening of business on the day following the date fixed
for such determination shall be increased by dividing such Settlement Rate by a
fraction of which the numerator shall be the number of shares of Common Stock
outstanding at the close of business on the date fixed for such determination
plus the number of shares of Common Stock which the aggregate of the offering
price of the total number of shares of Common Stock so offered for subscription
or purchase would purchase at such Current Market Price and the denominator
shall be the number of shares of Common Stock outstanding at the close of
business on the date fixed for such determination plus the number of shares of
Common Stock so offered for subscription or purchase, such increase to become
effective immediately after the opening of business on the day following the
date fixed for such determination. For the purposes of this paragraph (2), the
number of shares of Common Stock at any time outstanding shall not include
shares held in the treasury of the Company but shall include any shares issuable
in respect of any scrip certificates issued in lieu of fractions of shares of
Common Stock. The Company shall not issue any such rights, options or warrants
in respect of shares of Common Stock held in the treasury of the Company.

                  (3) In case outstanding shares of Common Stock shall be
subdivided or split into a greater number of shares of Common Stock, the
Settlement Rate in effect at the opening of business on the day following the
day upon which such subdivision or split becomes effective shall be
proportionately increased, and, conversely, in case outstanding shares of Common
Stock shall each be combined into a smaller number of shares of Common Stock,
the Settlement Rate in effect at the opening of business on the day following
the day upon which such combination becomes effective shall be proportionately
reduced, such increase or reduction, as the case may be, to become effective
immediately after the opening of business on the day following the day upon
which such subdivision, split or combination becomes effective.

                  (4) In case the Company shall, by dividend or otherwise,
distribute to all holders of its Common Stock evidences of its indebtedness or
assets (including securities, but excluding any rights or warrants referred to
in paragraph (2) of this Section, any dividend or distribution paid exclusively
in cash and any dividend or distribution referred to in paragraph (1) of this
Section), the Settlement Rate shall be adjusted so that the same shall equal the
rate determined by dividing the Settlement Rate in effect immediately prior to
the close of business on the date fixed for the determination of stockholders
entitled to receive such distribution by a fraction of which the numerator shall
be the Current Market Price per share of the Common

<PAGE>

Stock on the date fixed for such determination less the then fair market value
(as determined by the Board of Directors, whose determination shall be
conclusive and described in a Board Resolution) of the portion of the assets or
evidences of indebtedness so distributed applicable to one share of Common Stock
and the denominator shall be such Current Market Price per share of the Common
Stock, such adjustment to become effective immediately prior to the opening of
business on the day following the date fixed for the determination of
stockholders entitled to receive such distribution. In any case in which this
paragraph (4) is applicable, paragraph (2) of this Section shall not be
applicable.

                  (5) In case the Company shall, by dividend or otherwise,
distribute to all holders of its Common Stock (I) cash (excluding any cash that
is distributed in a Reorganization Event to which Section 5.6(b) applies or as
part of a distribution referred to in paragraph (4) of this Section) in an
aggregate amount that, combined together with the aggregate amount of any other
distributions to all holders of its Common Stock made exclusively in cash (other
than in connection with a Reorganization Event) within the 12 months preceding
the date of payment of such distribution and in respect of which no adjustment
pursuant to this paragraph (5) or paragraph (6) of this Section has been made
and (II) the aggregate of any cash plus the fair market value (as determined by
the Board of Directors, whose determination shall be conclusive and described in
a Board Resolution) of consideration payable in respect of any tender or
exchange offer by the Company or any of its subsidiaries for all or any portion
of the Common Stock concluded within the 12 months preceding the date of payment
of the distribution described in Clause (I) above and in respect of which no
adjustment pursuant to this paragraph (5) or paragraph (4) or paragraph (6) of
this Section has been made, exceeds 15% of the product of the Current Market
Price per share of the Common Stock on the date for the determination of holders
of shares of Common Stock entitled to receive such distribution times the number
of shares of Common Stock outstanding on such date, then, and in each such case,
immediately after the close of business on such date for determination, the
Settlement Rate shall be increased so that the same shall equal the rate
determined by dividing the Settlement Rate in effect immediately prior to the
close of business on the date fixed for determination of the stockholders
entitled to receive such distribution by a fraction (i) the numerator of which
shall be equal to the Current Market Price per share of the Common Stock on the
date fixed for such determination less an amount equal to the quotient of (x)
the combined amount distributed or payable in the transactions described in
clauses (I) and (II) above divided by (y) the number of shares of Common Stock
outstanding on such date for determination and (ii) the denominator of which
shall be equal to the Current Market Price per share of the Common Stock on such
date for determination.

                  (6) In case a tender or exchange offer made by the Company or
any subsidiary of the Company for all or any portion of the Common Stock shall
expire and such tender or exchange offer (as amended upon the expiration
thereof) shall require the payment to stockholders (based on the acceptance (up
to any maximum specified in the terms of the tender or exchange offer) of
Purchased Shares) of (I) an aggregate consideration having a fair market value
(as determined by the Board of Directors, whose determination shall be
conclusive and described in a Board Resolution) that combined together with the
aggregate of the cash plus the fair market value (as determined by the Board of
Directors, whose determination shall be conclusive and described in a Board
Resolution), as of the expiration of such tender or exchange

<PAGE>

offer, of consideration payable in respect of any other tender or exchange
offer, by the Company or any subsidiary of the Company for all or any portion of
the Common Stock expiring within the 12 months preceding the expiration of such
tender or exchange offer and in respect of which no adjustment pursuant to
paragraph (5) of this Section or this paragraph (6) has been made and (II) the
aggregate amount of any distributions to all holders of the Company's Common
Stock made exclusively in cash within the 12 months preceding the expiration of
such tender or exchange offer and in respect of which no adjustment pursuant to
paragraph (5) of this Section or this paragraph (6) has been made, exceeds 15%
of the product of the Current Market Price per share of the Common Stock as of
the last time (the "Expiration Time") tenders could have been made pursuant to
such tender or exchange offer (as it may be amended) times the number of shares
of Common Stock outstanding (including any tendered shares) on the Expiration
Time, then, and in each such case, immediately prior to the opening of business
on the day after the date of the Expiration Time, the Settlement Rate shall be
adjusted so that the same shall equal the rate determined by dividing the
Settlement Rate immediately prior to the close of business on the date of the
Expiration Time by a fraction (i) the numerator of which shall be equal to (A)
the product of (1) the Current Market Price per share of the Common Stock on the
date of the Expiration Time and (2) the number of shares of Common Stock
outstanding (including any tendered shares) on the Expiration Time less (B) the
amount of cash plus the fair market value (determined as aforesaid) of the
aggregate consideration payable to stockholders based on the transactions
described in clauses (I) and (II) above (assuming in the case of clause (I) the
acceptance, up to any maximum specified in the terms of the tender or exchange
offer, of Purchased Shares), and (ii) the denominator of which shall be equal to
the product of (A) the Current Market Price per share of the Common Stock as of
the Expiration Time and (B) the number of shares of Common Stock outstanding
(including any tendered shares) as of the Expiration Time less the number of all
shares validly tendered and not withdrawn as of the Expiration Time (the shares
deemed so accepted, up to any such maximum, being referred to as the "Purchased
Shares").

                  (7) The reclassification of Common Stock into securities
including securities other than Common Stock (other than any reclassification
upon a Reorganization Event to which Section 5.6(b) applies) shall be deemed to
involve (a) a distribution of such securities other than Common Stock to all
holders of Common Stock (and the effective date of such reclassification shall
be deemed to be "the date fixed for the determination of stockholders entitled
to receive such distribution" and the "date fixed for such determination" within
the meaning of paragraph (4) of this Section), and (b) a subdivision, split or
combination, as the case may be, of the number of shares of Common Stock
outstanding immediately prior to such reclassification into the number of shares
of Common Stock outstanding immediately thereafter (and the effective date of
such reclassification shall be deemed to be "the day upon which such subdivision
or split becomes effective" or "the day upon which such combination becomes
effective", as the case may be, and "the day upon which such subdivision, split
or combination becomes effective" within the meaning of paragraph (3) of this
Section).

                  (8) The "Current Market Price" per share of Common Stock on
any day means the average of the daily Closing Prices for the five consecutive
Trading Days selected by the Company commencing not more than 30 Trading Days
before, and ending not later than, the earlier of the day in question and the
day before the "ex date" with respect to the issuance or

<PAGE>

distribution requiring such computation. For purposes of this paragraph, the
term "ex date", when used with respect to any issuance or distribution, shall
mean the first date on which the Common Stock trades regular way on such
exchange or in such market without the right to receive such issuance or
distribution.

                  (9) All adjustments to the Settlement Rate shall be calculated
to the nearest 1/10,000th of a share of Common Stock (or if there is not a
nearest 1/10,000th of a share, to the next lower 1/10,000th of a share). No
adjustment in the Settlement Rate shall be required unless such adjustment would
require an increase or decrease of at least one percent thereof; provided,
however, that any adjustments which by reason of this subparagraph are not
required to be made shall be carried forward and taken into account in any
subsequent adjustment. If an adjustment is made to the Settlement Rate pursuant
to paragraph (1), (2), (3), (4), (5), (6), (7) or (10) of this Section 5.6(a),
an adjustment shall also be made to the Applicable Market Value solely to
determine which of clauses (a), (b) or (c) of the definition of Settlement Rate
in Section 5.1 will apply on the Purchase Contract Settlement Date. Such
adjustment shall be made by multiplying the Applicable Market Value by a
fraction of which the numerator shall be the Settlement Rate immediately after
such adjustment pursuant to paragraph (1), (2), (3), (4), (5), (6), (7) or (10)
of this Section 5.6(a) and the denominator shall be the Settlement Rate
immediately before such adjustment; provided, however, that if such adjustment
to the Settlement Rate is required to be made pursuant to the occurrence of any
of the events contemplated by paragraph (1), (2), (3), (4), (5), (7) or (10) of
this Section 5.6(a) during the period taken into consideration for determining
the Applicable Market Value, appropriate and customary adjustments shall be made
to the Settlement Rate.

                  (10) The Company may make such increases in the Settlement
Rate, in addition to those required by this Section, as it considers to be
advisable in order to avoid or diminish any income tax to any holders of shares
of Common Stock resulting from any dividend or distribution of stock or issuance
of rights or warrants to purchase or subscribe for stock or from any event
treated as such for income tax purposes or for any other reason.

         (b)      Adjustment for Consolidation, Merger or Other Reorganization
Event.

                  In the event of (i) any consolidation or merger of the Company
with or into another Person (other than a merger or consolidation in which the
Company is the continuing corporation and in which the Common Stock outstanding
immediately prior to the merger or consolidation is not exchanged for cash,
securities or other property of the Company or another corporation), (ii) any
sale, transfer, lease or conveyance to another Person of the property of the
Company as an entirety or substantially as an entirety, (iii) any statutory
exchange of securities of the Company with another Person (other than in
connection with a merger or acquisition) or (iv) any liquidation, dissolution or
winding up of the Company other than as a result of or after the occurrence of a
Termination Event (any such event, a "Reorganization Event"), the Settlement
Rate will be adjusted to provide that each Holder of Securities will receive on
the Purchase Contract Settlement Date with respect to each Purchase Contract
forming a part thereof, the kind and amount of securities, cash and other
property receivable upon such Reorganization Event (without any interest
thereon, and without any right to dividends or distribution thereon which have a
record date that is prior to the Purchase Contract Settlement Date) by a Holder
of

<PAGE>

the number of shares of Common Stock issuable on account of each Purchase
Contract if the Purchase Contract Settlement Date had occurred immediately prior
to such Reorganization Event assuming such Holder of Common Stock is not a
Person with which the Company consolidated or into which the Company merged or
which merged into the Company or to which such sale or transfer was made, as the
case may be (any such Person, a "Constituent Person"), or an Affiliate of a
Constituent Person to the extent such Reorganization Event provides for
different treatment of Common Stock held by Affiliates of the Company and
non-affiliates and such Holder failed to exercise his rights of election, if
any, as to the kind or amount of securities, cash and other property receivable
upon such Reorganization Event (provided that if the kind or amount of
securities, cash and other property receivable upon such Reorganization Event is
not the same for each share of Common Stock held immediately prior to such
Reorganization Event by other than a Constituent Person or an Affiliate thereof
and in respect of which such rights of election shall not have been exercised
("non-electing share"), then for the purpose of this Section the kind and amount
of securities, cash and other property receivable upon such Reorganization Event
by each non-electing share shall be deemed to be the kind and amount so
receivable per share by a plurality of the non-electing shares). In the event of
such a Reorganization Event, the Person formed by such consolidation, merger or
exchange or the Person which acquires the assets of the Company or, in the event
of a liquidation or dissolution of the Company, the Company or a liquidating
trust created in connection therewith, shall execute and deliver to the Agent an
agreement supplemental hereto providing that the Holders of each Outstanding
Security shall have the rights provided by this Section 5.6(b). Such
supplemental agreement shall provide for adjustments which, for events
subsequent to the effective date of such supplemental agreement, shall be as
nearly equivalent as may be practicable to the adjustments provided for in this
Section. The above provisions of this Section shall similarly apply to
successive Reorganization Events.

Section 5.7.      NOTICE OF ADJUSTMENTS AND CERTAIN OTHER EVENTS.

         (a)      Whenever the Settlement Rate is adjusted as herein provided,
the Company shall:

                         (i) forthwith compute the adjusted Settlement Rate in
         accordance with Section 5.6 and prepare and transmit to the Agent an
         Officers' Certificate setting forth the Settlement Rate, the method of
         calculation thereof in reasonable detail, and the facts requiring such
         adjustment and upon which such adjustment is based; and

                        (ii) within 10 Business Days following the occurrence of
         an event that requires an adjustment to the Settlement Rate pursuant to
         Section 5.6 (or if the Company is not aware of such occurrence, as soon
         as practicable after becoming so aware), provide a written notice to
         the Holders of the Securities of the occurrence of such event and a
         statement in reasonable detail setting forth the method by which the
         adjustment to the Settlement Rate was determined and setting forth the
         adjusted Settlement Rate.

         (b) The Agent shall not at any time be under any duty or responsibility
to any Holder of Securities to determine whether any facts exist which may
require any adjustment of the Settlement Rate, or with respect to the nature or
extent or calculation of any such adjustment when made, or with respect to the
method employed in making the same. The Agent shall not be

<PAGE>

accountable with respect to the validity or value (or the kind or amount) of any
shares of Common Stock, or of any securities or property, which may at the time
be issued or delivered with respect to any Purchase Contract; and the Agent
makes no representation with respect thereto. The Agent shall not be responsible
for any failure of the Company to issue, transfer or deliver any shares of
Common Stock pursuant to a Purchase Contract or to comply with any of the
duties, responsibilities or covenants of the Company contained in this Article.

Section 5.8.      TERMINATION EVENT; NOTICE.

         The Purchase Contracts and all obligations and rights of the Company
and the Holders thereunder, including, without limitation, the rights of the
Holders to receive and the obligation of the Company to pay any Contract
Adjustment Payments, if the Company shall have such obligation, and the rights
and obligations of Holders to purchase Common Stock, shall immediately and
automatically terminate, without the necessity of any notice or action by any
Holder, the Agent or the Company, if, on or prior to the Purchase Contract
Settlement Date, a Termination Event shall have occurred. Upon and after the
occurrence of a Termination Event, the Securities shall thereafter represent the
right to receive the Debentures forming a part of such Securities in the case of
Type A Units, or Treasury Securities in the case of Type B Units, in accordance
with the provisions of Section 5.4 of the Pledge Agreement. Upon the occurrence
of a Termination Event, the Company shall promptly but in no event later than
two Business Days thereafter give written notice to the Agent, the Collateral
Agent and the Holders, at their addresses as they appear in the Register.

Section 5.9.      EARLY SETTLEMENT.

         (a) Subject to and upon compliance with the provisions of this Section
5.9, at the option of the Holder thereof, Purchase Contracts underlying
Securities may be settled early ("Early Settlement") in the case of Type A Units
on or prior to the seventh Business Day immediately preceding the Purchase
Contract Settlement Date and in the case of Type B Units on or prior to the
second Business Day immediately preceding the Purchase Contract Settlement Date,
in each case, as provided herein. In order to exercise the right to effect Early
Settlement with respect to any Purchase Contracts, the Holder of the Certificate
evidencing Securities shall deliver such Certificate to the Agent at the
Corporate Trust Office duly endorsed for transfer to the Company or in blank
with the form of Election to Settle Early on the reverse thereof duly completed
and accompanied by payment (payable to the Company in immediately available
funds) in an amount (the "Early Settlement Amount") equal to (i) the product of
(A) the Stated Amount times (B) the number of Purchase Contracts with respect to
which the Holder has elected to effect Early Settlement plus (ii) if such
delivery is made with respect to any Purchase Contracts during the period from
the close of business on any Record Date next preceding any Payment Date to the
opening of business on such Payment Date, an amount equal to the sum of (x) the
Contract Adjustment Payments payable on such Payment Date with respect to such
Purchase Contracts plus (y) in the case of a Type A Unit Certificate, the
distributions on the related Debentures payable on such Payment Date. Except as
provided in the immediately preceding sentence and subject to the last paragraph
of Section 5.2, no payment or adjustment shall be made upon Early Settlement of
any Purchase Contract on account of any Contract Adjustment Payments accrued on
such Purchase Contract or on account of any dividends on the

<PAGE>

Common Stock issued upon such Early Settlement. If the foregoing requirements
are first satisfied with respect to Purchase Contracts underlying any Securities
at or prior to 5:00 p.m., New York City time, on a Business Day, such day shall
be the "Early Settlement Date" with respect to such Securities and if such
requirements are first satisfied after 5:00 p.m., New York City time, on a
Business Day or on a day that is not a Business Day, the "Early Settlement Date"
with respect to such Securities shall be the next succeeding Business Day.

         (b) Upon Early Settlement of Purchase Contracts by a Holder of the
related Securities, the Company shall issue, and the Holder shall be entitled to
receive, [________] shares of Common Stock on account of each Purchase Contract
as to which Early Settlement is effected (the "Early Settlement Rate"). The
Early Settlement Rate shall be adjusted in the same manner and at the same time
as the Settlement Rate is adjusted.

         (c) No later than the third Business Day after the applicable Early
Settlement Date, the Company shall cause (i) the shares of Common Stock issuable
upon Early Settlement of Purchase Contracts to be issued and delivered, together
with payment in lieu of any fraction of a share, as provided in Section 5.10,
and (ii) the related Debentures, in the case of Type A Units, or the related
Treasury Securities, in the case of Type B Units, to be released from the Pledge
by the Collateral Agent and transferred, in each case, to the Agent for delivery
to the Holder thereof or its designee.

         (d) Upon Early Settlement of any Purchase Contracts, and subject to
receipt of shares of Common Stock from the Company and the Debentures or
Treasury Securities, as the case may be, from the Securities Intermediary, as
applicable, the Agent shall, in accordance with the instructions provided by the
Holder thereof on the applicable form of Election to Settle Early on the reverse
of the Certificate evidencing the related Securities, (i) transfer to the Holder
the Debentures or Treasury Securities, as the case may be, forming a part of
such Securities, and (ii) deliver to the Holder a certificate or certificates
for the full number of shares of Common Stock issuable upon such Early
Settlement, together with payment in lieu of any fraction of a share, as
provided in Section 5.10.

         (e) In the event that Early Settlement is effected with respect to
Purchase Contracts underlying less than all the Securities evidenced by a
Certificate, upon such Early Settlement the Company shall execute and the Agent
shall authenticate, countersign and deliver to the Holder thereof, at the
expense of the Company, a Certificate evidencing the Securities as to which
Early Settlement was not effected.

Section 5.10.     NO FRACTIONAL SHARES.

         No fractional shares or scrip representing fractional shares of Common
Stock shall be issued or delivered upon settlement on the Purchase Contract
Settlement Date or upon Early Settlement of any Purchase Contracts. If
Certificates evidencing more than one Purchase Contract shall be surrendered for
settlement at one time by the same Holder, the number of full shares of Common
Stock which shall be delivered upon settlement shall be computed on the basis of
the aggregate number of Purchase Contracts evidenced by the Certificates so
surrendered. Instead of any fractional share of Common Stock which would
otherwise be

<PAGE>

deliverable upon settlement of any Purchase Contracts on the Purchase Contract
Settlement Date or upon Early Settlement, the Company, through the Agent, shall
make a cash payment in respect of such fractional interest in an amount equal to
the value of such fractional shares times the Applicable Market Value. The
Company shall provide the Agent from time to time with sufficient funds to
permit the Agent to make all cash payments required by this Section 5.10 in a
timely manner.

Section 5.11.     CHARGES AND TAXES.

         The Company will pay all stock transfer and similar taxes attributable
to the initial issuance and delivery of the shares of Common Stock pursuant to
the Purchase Contracts; provided, however, that the Company shall not be
required to pay any such tax or taxes which may be payable in respect of any
exchange of or substitution for a Certificate evidencing a Security or any
issuance of a share of Common Stock in a name other than that of the registered
Holder of a Certificate surrendered in respect of the Securities evidenced
thereby, other than in the name of the Agent, as custodian for such Holder, and
the Company shall not be required to issue or deliver such share certificates or
Certificates unless or until the Person or Persons requesting the transfer or
issuance thereof shall have paid to the Company the amount of such tax or shall
have established to the satisfaction of the Company that such tax has been paid.

                                   ARTICLE VI

                                    Remedies

Section 6.1.      UNCONDITIONAL RIGHT OF HOLDERS TO RECEIVE CONTRACT ADJUSTMENT
                  PAYMENTS AND TO PURCHASE COMMON STOCK.

         In the event that Contract Adjustment Payments shall constitute a
component of Type A Units or Type B Units, the Holder of any Type A Unit or Type
B Unit shall have the right, which is absolute and unconditional (subject to the
payment by a holder of Contract Adjustment Payments pursuant to Section 5.9(a)),
to receive payment of each installment of the Contract Adjustment Payments with
respect to the Purchase Contract constituting a part of such Security on the
respective Payment Date for such Security and to purchase Common Stock pursuant
to such Purchase Contract and, in each such case, to institute suit for the
enforcement of any such payment and right to purchase Common Stock, and such
rights shall not be impaired without the consent of such Holder.

Section 6.2.      RESTORATION OF RIGHTS AND REMEDIES.

         If any Holder has instituted any proceeding to enforce any right or
remedy under this Agreement and such proceeding has been discontinued or
abandoned for any reason, or has been determined adversely to such Holder, then
and in every such case, subject to any determination in such proceeding, the
Company and such Holder shall be restored severally and respectively to their
former positions hereunder and thereafter all rights and remedies of such Holder
shall continue as though no such proceeding had been instituted.

<PAGE>

Section 6.3.      RIGHTS AND REMEDIES CUMULATIVE.

         Except as otherwise provided with respect to the replacement or payment
of mutilated, destroyed, lost or stolen Certificates in the last paragraph of
Section 3.10, no right or remedy herein conferred upon or reserved to the
Holders is intended to be exclusive of any other right or remedy, and every
right and remedy shall, to the extent permitted by law, be cumulative and in
addition to every other right and remedy given hereunder or now or hereafter
existing at law or in equity or otherwise. The assertion or employment of any
right or remedy hereunder, or otherwise, shall not prevent the concurrent
assertion or employment of any other appropriate right or remedy.

Section 6.4.      DELAY OR OMISSION NOT WAIVER.

         No delay or omission of any Holder to exercise any right or remedy upon
a default shall impair any such right or remedy or constitute a waiver of any
such right. Every right and remedy given by this Article or by law to the
Holders may be exercised from time to time, and as often as may be deemed
expedient, by such Holders.

Section 6.5.      UNDERTAKING FOR COSTS.

         All parties to this Agreement agree, and each Holder of Type A Units or
Type B Units, by its acceptance of such Type A Units or Type B Units, shall be
deemed to have agreed, that any court may in its discretion require, in any suit
for the enforcement of any right or remedy under this Agreement, or in any suit
against the Agent for any action taken, suffered or omitted by it as Agent, the
filing by any party litigant in such suit of an undertaking to pay the costs of
such suit, and that such court may in its discretion assess reasonable costs,
including reasonable attorneys' fees, against any party litigant in such suit,
having due regard to the merits and good faith of the claims or defenses made by
such party litigant; provided that the provisions of this Section shall not
apply to any suit instituted by the Company, to any suit instituted by the
Agent, to any suit instituted by any Holder, or group of Holders, holding in the
aggregate more than 10% of the Outstanding Securities, or to any suit instituted
by any Holder for the enforcement of interest payable on any Debentures or
Contract Adjustment Payments, if any, on any Purchase Contract on or after the
respective Payment Date therefor in respect of any Security held by such Holder,
or for enforcement of the right to purchase shares of Common Stock under the
Purchase Contracts constituting part of any Security held by such Holder.

Section 6.6.      WAIVER OF STAY OR EXTENSION LAWS.

         The Company covenants (to the extent that it may lawfully do so) that
it will not at any time insist upon, or plead, or in any manner whatsoever claim
or take the benefit or advantage of, any stay or extension law wherever enacted,
now or at any time hereafter in force, which may affect the covenants or the
performance of this Agreement; and the Company (to the extent that it may
lawfully do so) hereby expressly waives all benefit or advantage of any such law
and covenants that it will not hinder, delay or impede the execution of any
power herein granted to the Agent or the Holders, but will suffer and permit the
execution of every such power as though no such law had been enacted.

<PAGE>

                                   ARTICLE VII

                                    The Agent

Section 7.1.      CERTAIN DUTIES AND RESPONSIBILITIES.

         (a) (1) The Agent undertakes to perform, with respect to the
         Securities, such duties and only such duties as are specifically set
         forth in this Agreement and the Pledge Agreement, and no implied
         covenants or obligations shall be read into this Agreement or the
         Pledge Agreement against the Agent; and

                  (2) in the absence of bad faith or negligence on its part, the
         Agent may, with respect to the Securities, conclusively rely, as to the
         truth of the statements and the correctness of the opinions expressed
         therein, upon certificates or opinions furnished to the Agent and
         conforming to the requirements of this Agreement or the Pledge
         Agreement, as applicable, but in the case of any certificates or
         opinions which by any provision hereof are specifically required to be
         furnished to the Agent, the Agent shall be under a duty to examine the
         same to determine whether or not they conform to the requirements of
         this Agreement or the Pledge Agreement, as applicable.

         (b) No provision of this Agreement or the Pledge Agreement shall be
construed to relieve the Agent from liability for its own negligent action, its
own negligent failure to act, or its own wilful misconduct, except that

                  (1)      this Subsection shall not be construed to limit the
         effect of Subsection (a) of this Section;

                  (2) the Agent shall not be liable for any error of judgment
         made in good faith by a Responsible Officer, unless it shall be proved
         that the Agent was negligent in ascertaining the pertinent facts; and

                  (3) no provision of this Agreement or the Pledge Agreement
         shall require the Agent to expend or risk its own funds or otherwise
         incur any financial liability in the performance of any of its duties
         hereunder, or in the exercise of any of its rights or powers, if
         adequate indemnity is not provided to it.

         (c) Whether or not therein expressly so provided, every provision of
this Agreement and the Pledge Agreement relating to the conduct or affecting the
liability of or affording protection to the Agent shall be subject to the
provisions of this Section.

         (d) The Agent is authorized to execute and deliver the Pledge Agreement
in its capacity as Agent.

<PAGE>

Section 7.2.      NOTICE OF DEFAULT.

         Within 30 days after the occurrence of any default by the Company
hereunder of which a Responsible Officer of the Agent has actual knowledge, the
Agent shall transmit by mail to the Company and the Holders of Securities, as
their names and addresses appear in the Register, notice of such default
hereunder, unless such default shall have been cured or waived.

Section 7.3.      CERTAIN RIGHTS OF AGENT.

         Subject to the provisions of Section 7.1:

                  (a) the Agent may rely and shall be protected in acting or
         refraining from acting upon any resolution, certificate, statement,
         instrument, opinion, report, notice, request, direction, consent,
         order, bond, debenture, note, other evidence of indebtedness or other
         paper or document believed by it to be genuine and to have been signed
         or presented by the proper party or parties;

                  (b) any request or direction of the Company mentioned herein
         shall be sufficiently evidenced by an Officers' Certificate, Issuer
         Order or Issuer Request, and any resolution of the Board of Directors
         of the Company may be sufficiently evidenced by a Board Resolution;

                  (c) whenever in the administration of this Agreement or the
         Pledge Agreement the Agent shall deem it desirable that a matter be
         proved or established prior to taking, suffering or omitting any action
         hereunder, the Agent (unless other evidence be herein specifically
         prescribed) may, in the absence of bad faith on its part, rely upon an
         Officers' Certificate of the Company;

                  (d) the Agent may consult with counsel and the written advice
         of such counsel or any Opinion of Counsel shall be full and complete
         authorization and protection in respect of any action taken, suffered
         or omitted by it hereunder in good faith and in reliance thereon;

                  (e) the Agent shall not be bound to make any investigation
         into the facts or matters stated in any resolution, certificate,
         statement, instrument, opinion, report, notice, request, direction,
         consent, order, bond, debenture, note, other evidence of indebtedness
         or other paper or document, but the Agent, in its discretion, may make
         reasonable further inquiry or investigation into such facts or matters
         related to the execution, delivery and performance of the Purchase
         Contracts as it may see fit, and, if the Agent shall determine to make
         such further inquiry or investigation, it shall be given a reasonable
         opportunity to examine the books, records and premises of the Company,
         personally or by agent or attorney; and

                  (f) the Agent may execute any of the powers hereunder or
         perform any duties hereunder either directly or by or through agents or
         attorneys or an Affiliate and the Agent

<PAGE>

         shall not be responsible for any misconduct or negligence on the part
         of any agent or attorney or an Affiliate appointed with due care by it
         hereunder.

Section 7.4.      NOT RESPONSIBLE FOR RECITALS OR ISSUANCE OF SECURITIES.

         The recitals contained herein and in the Certificates shall be taken as
the statements of the Company, and the Agent assumes no responsibility for their
accuracy, other than for the Certificate of Authentication contained in the
Certificates. The Agent makes no representations as to the validity or
sufficiency of either this Agreement or of the Securities, or of the Pledge
Agreement or the Pledge. The Agent shall not be accountable for the use or
application by the Company of the proceeds in respect of the Purchase Contracts.

Section 7.5.      MAY HOLD SECURITIES.

         Any Registrar or any other agent of the Company, or the Agent and its
Affiliates, in their individual or any other capacity, may become the owner or
pledgee of Securities and may otherwise deal with the Company, the Collateral
Agent or any other Person with the same rights it would have if it were not
Registrar or such other agent, or the Agent.

Section 7.6.      MONEY HELD IN CUSTODY.

         Money held by the Agent in custody hereunder need not be segregated
from the other funds except to the extent required by law or provided herein.
The Agent shall be under no obligation to invest or pay interest on any money
received by it hereunder except as otherwise agreed in writing with the Company.

Section 7.7.      COMPENSATION AND REIMBURSEMENT.

         The Company agrees:

                  (1) to pay to the Agent from time to time reasonable
         compensation for all services rendered by it hereunder and under the
         Pledge Agreement;

                  (2) except as otherwise expressly provided for herein, to
         reimburse the Agent upon its request for all reasonable expenses,
         disbursements and advances incurred or made by the Agent in accordance
         with any provision of this Agreement and the Pledge Agreement
         (including the reasonable compensation and the expenses and
         disbursements of its agents and counsel), except any such expense,
         disbursement or advance as may be attributable to its negligence or bad
         faith; and

                  (3) to indemnify the Agent and any predecessor Agent for, and
         to hold it harmless against, any loss, liability or expense incurred
         without negligence or bad faith on its part, arising out of or in
         connection with the acceptance or administration of its duties
         hereunder, including the costs and expenses of defending itself against
         any claim or liability in connection with the exercise or performance
         of any of its powers or duties hereunder.

<PAGE>

Section 7.8.      CORPORATE AGENT REQUIRED; ELIGIBILITY.

         There shall at all times be an Agent hereunder which shall be a
corporation organized and doing business under the laws of the United States of
America, any State thereof or the District of Columbia, authorized under such
laws to exercise corporate trust powers, having (or being a member of a bank
holding company having) a combined capital and surplus of at least $50,000,000,
subject to supervision or examination by Federal or State authority and having a
Corporate Trust Office in the Borough of Manhattan, The City of New York, if
there be such a corporation in the Borough of Manhattan, The City of New York,
qualified and eligible under this Article and willing to act on reasonable
terms. If such corporation publishes reports of condition at least annually,
pursuant to law or to the requirements of said supervising or examining
authority, then for the purposes of this Section, the combined capital and
surplus of such corporation shall be deemed to be its combined capital and
surplus as set forth in its most recent report of condition so published. If at
any time the Agent shall cease to be eligible in accordance with the provisions
of this Section, it shall resign immediately in the manner and with the effect
hereinafter specified in this Article.

Section 7.9.      RESIGNATION AND REMOVAL; APPOINTMENT OF SUCCESSOR.

         (a) No resignation or removal of the Agent and no appointment of a
successor Agent pursuant to this Article shall become effective until the
acceptance of appointment by the successor Agent in accordance with the
applicable requirements of Section 7.10.

         (b) The Agent may resign at any time by giving written notice thereof
to the Company 60 days prior to the effective date of such resignation. If the
instrument of acceptance by a successor Agent required by Section 7.10 shall not
have been delivered to the Agent within 30 days after the giving of such notice
of resignation, the resigning Agent may petition any court of competent
jurisdiction for the appointment of a successor Agent.

         (c) The Agent may be removed at any time by Act of the Holders of a
majority in number of the Outstanding Securities delivered to the Agent and the
Company.

         (d)  If at any time

                  (1) the Agent fails to comply with Section 310(b) of the TIA,
         as if the Agent were an indenture trustee under an indenture qualified
         under the TIA, after written request therefor by the Company or by any
         Holder who has been a bona fide Holder of a Security for at least six
         months, or

                  (2) the Agent shall cease to be eligible under Section 7.8 and
         shall fail to resign after written request therefor by the Company or
         by any such Holder, or

                  (3) the Agent shall become incapable of acting or shall be
         adjudged a bankrupt or insolvent or a receiver of the Agent or of its
         property shall be appointed or any public officer shall take charge or
         control of the Agent or of its property or affairs for the purpose of
         rehabilitation, conservation or liquidation,

<PAGE>

then, in any such case, (i) the Company by a Board Resolution may remove the
Agent, or (ii) any Holder who has been a bona fide Holder of a Security for at
least six months may, on behalf of himself and all others similarly situated,
petition any court of competent jurisdiction for the removal of the Agent and
the appointment of a successor Agent.

         (e) If the Agent shall resign, be removed or become incapable of
acting, or if a vacancy shall occur in the office of Agent for any cause, the
Company, by a Board Resolution, shall promptly appoint a successor Agent and
shall comply with the applicable requirements of Section 7.10. If no successor
Agent shall have been so appointed by the Company and accepted appointment in
the manner required by Section 7.10, any Holder who has been a bona fide Holder
of a Security for at least six months may, on behalf of itself and all others
similarly situated, petition any court of competent jurisdiction for the
appointment of a successor Agent.

         (f) The Company shall give, or shall cause such successor Agent to
give, notice of each resignation and each removal of the Agent and each
appointment of a successor Agent by mailing written notice of such event by
first-class mail, postage prepaid, to all Holders as their names and addresses
appear in the applicable Register. Each notice shall include the name of the
successor Agent and the address of its Corporate Trust Office.

Section 7.10.     ACCEPTANCE OF APPOINTMENT BY SUCCESSOR.

         (a) In case of the appointment hereunder of a successor Agent, every
such successor Agent so appointed shall execute, acknowledge and deliver to the
Company and to the retiring Agent an instrument accepting such appointment, and
thereupon the resignation or removal of the retiring Agent shall become
effective and such successor Agent, without any further act, deed or conveyance,
shall become vested with all the rights, powers, agencies and duties of the
retiring Agent; but, on the request of the Company or the successor Agent, such
retiring Agent shall, upon payment of its charges, execute and deliver an
instrument transferring to such successor Agent all the rights, powers and
trusts of the retiring Agent and shall duly assign, transfer and deliver to such
successor Agent all property and money held by such retiring Agent hereunder.

         (b) Upon request of any such successor Agent, the Company shall execute
any and all instruments for more fully and certainly vesting in and confirming
to such successor Agent all such rights, powers and agencies referred to in
paragraph (a) of this Section.

         (c) No successor Agent shall accept its appointment unless at the time
of such acceptance such successor Agent shall be qualified and eligible under
this Article.

Section 7.11.     MERGER, CONVERSION, CONSOLIDATION OR SUCCESSION TO BUSINESS.

         Any corporation into which the Agent may be merged or converted or with
which it may be consolidated, or any corporation resulting from any merger,
conversion or consolidation to which the Agent shall be a party, or any
corporation succeeding to all or substantially all the corporate trust business
of the Agent, shall be the successor of the Agent hereunder, provided such
corporation shall be otherwise qualified and eligible under this Article, with
the execution or filing of any paper or any further act on the part of any of
the parties hereto. In case any

<PAGE>

Certificates shall have been authenticated and executed on behalf of the
Holders, but not delivered, by the Agent then in office, any successor by
merger, conversion or consolidation to such Agent may adopt such authentication
and execution and deliver the Certificates so authenticated and executed with
the same effect as if such successor Agent had itself authenticated and executed
such Securities.

Section 7.12.     PRESERVATION OF INFORMATION; COMMUNICATIONS TO HOLDERS.

         (a) The Agent shall preserve, in as current a form as is reasonably
practicable, the names and addresses of Holders received by the Agent in its
capacity as Registrar.

         (b) If three or more Holders (herein referred to as "applicants") apply
in writing to the Agent, and furnish to the Agent reasonable proof that each
such applicant has owned a Security for a period of at least six months
preceding the date of such application, and such application states that the
applicants desire to communicate with other Holders with respect to their rights
under this Agreement or under the Securities and is accompanied by a copy of the
form of proxy or other communication which such applicants propose to transmit,
then the Agent shall mail to all the Holders copies of the form of proxy or
other communication which is specified in such request, with reasonable
promptness after a tender to the Agent of the materials to be mailed and of
payment, or provision for the payment, of the reasonable expenses of such
mailing.

Section 7.13.     NO OBLIGATIONS OF AGENT.

         Except to the extent otherwise expressly provided in this Agreement,
the Agent assumes no obligations and shall not be subject to any liability under
this Agreement, the Pledge Agreement or any Purchase Contract in respect of the
obligations of the Holder of any Security thereunder. The Company agrees, and
each Holder of a Certificate, by his acceptance thereof, shall be deemed to have
agreed, that the Agent's execution of the Certificates on behalf of the Holders
shall be solely as agent and attorney-in-fact for the Holders, and that the
Agent shall have no obligation to perform such Purchase Contracts on behalf of
the Holders, except to the extent expressly provided in Article Five hereof.
Anything in this Agreement to the contrary notwithstanding, in no event shall
the Agent or its officers, employees or agents be liable under this Agreement to
any third party for indirect, special, punitive, or consequential loss or damage
of any kind whatsoever, including lost profits, whether or not the likelihood of
such loss or damage was known to the Agent, incurred without any act or deed
that is found to be attributable to gross negligence or willful misconduct on
the part of the Agent.

Section 7.14.     TAX COMPLIANCE.

         (a) The Company will comply with all applicable certification,
information reporting and withholding (including "backup" withholding)
requirements imposed by applicable tax laws, regulations or administrative
practice with respect to (i) any payments made with respect to the Securities or
(ii) the issuance, delivery, holding, transfer, redemption or exercise of rights
under the Securities. Such compliance shall include, without limitation, the
preparation and timely filing of required returns and the timely payment of all
amounts required to be withheld to the appropriate taxing authority or its
designated agent.

<PAGE>

         (b) The Agent shall comply in accordance with the terms hereof with any
written direction received from the Company with respect to the execution or
certification of any required documentation and the application of such
requirements to particular payments or Holders or in other particular
circumstances, and may for purposes of this Agreement rely on any such direction
in accordance with the provisions of Section 7.1(a)(2) hereof.

         (c) The Agent shall maintain all appropriate records documenting
compliance with such requirements, and shall make such records available, on
written request, to the Company or its authorized representative within a
reasonable period of time after receipt of such request.

                                  ARTICLE VIII

                             Supplemental Agreements

Section 8.1.      SUPPLEMENTAL AGREEMENTS WITHOUT CONSENT OF HOLDERS.

         Without the consent of any Holders, the Company and the Agent, at any
time and from time to time, may enter into one or more agreements supplemental
hereto, in form satisfactory to the Company and the Agent, for any of the
following purposes:

                  (1) to evidence the succession of another Person to the
         Company, and the assumption by any such successor of the covenants of
         the Company herein and in the Certificates; or

                  (2) to add to the covenants of the Company for the benefit of
         the Holders, or to surrender any right or power herein conferred upon
         the Company; or

                  (3) to evidence and provide for the acceptance of appointment
         hereunder by a successor Agent; or

                  (4) to make provision with respect to the rights of Holders
         pursuant to the requirements of Section 5.6(b); or

                  (5) except as provided for in Section 5.6, to cure any
         ambiguity, to correct or supplement any provisions herein which may be
         inconsistent with any other provisions herein, or to make any other
         provisions with respect to such matters or questions arising under this
         Agreement, provided such action shall not adversely affect the
         interests of the Holders.

Section 8.2.      SUPPLEMENTAL AGREEMENTS WITH CONSENT OF HOLDERS.

         With the consent of the Holders of not less than a majority of the
outstanding Purchase Contracts voting together as one class, by Act of said
Holders delivered to the Company and the Agent, the Company, when authorized by
a Board Resolution, and the Agent may enter into an agreement or agreements
supplemental hereto for the purpose of modifying in any manner the

<PAGE>

terms of the Purchase Contracts, or the provisions of this Agreement or the
rights of the Holders in respect of the Securities; provided, however, that,
except as contemplated herein, no such supplemental agreement shall, without the
unanimous consent of the Holders of each outstanding Purchase Contract affected
thereby,

                  (1)  change any Payment Date;

                  (2) change the amount or the type of Collateral required to be
         Pledged to secure a Holder's obligations under the Purchase Contract,
         impair the right of the Holder of any Purchase Contract to receive
         interest on the related Collateral (except for the rights of Holders of
         Type A Units to substitute the Treasury Securities for the Pledged
         Debentures or the rights of Holders of Type B Units to substitute
         Debentures for the Pledged Treasury Securities) or otherwise adversely
         affect the Holder's rights in or to such Collateral or adversely alter
         the rights in or to such Collateral;

                  (3) reduce any Contract Adjustment Payments or change any
         place where, or the coin or currency in which, any Contract Adjustment
         Payment is payable;

                  (4) impair the right to institute suit for the enforcement of
any Purchase Contract;

                  (5) reduce the number of shares of Common Stock to be
         purchased pursuant to any Purchase Contract, increase the price to
         purchase shares of Common Stock upon settlement of any Purchase
         Contract, change the Purchase Contract Settlement Date or otherwise
         adversely affect the Holder's rights under any Purchase Contract; or

                  (6) reduce the percentage of the outstanding Purchase
         Contracts the consent of whose Holders is required for any such
         supplemental agreement;

PROVIDED that if any amendment or proposal referred to above would adversely
affect only the Type A Units or the Type B Units, then only the affected class
of Holder as of the record date for the Holders entitled to vote thereon will be
entitled to vote on such amendment or proposal, and such amendment or proposal
shall not be effective except with the consent of Holders of not less than a
majority of such class; provided that the unanimous consent of the Holders of
each outstanding Purchase Contract of such class affected thereby shall be
required to approve any amendment or proposal specified in clauses (1) - (6)
above.

         It shall not be necessary for any Act of Holders under this Section to
approve the particular form of any proposed supplemental agreement, but it shall
be sufficient if such Act shall approve the substance thereof.

Section 8.3.      EXECUTION OF SUPPLEMENTAL AGREEMENTS.

         In executing, or accepting the additional agencies created by, any
supplemental agreement permitted by this Article or the modifications thereby of
the agencies created by this Agreement, the Agent shall be entitled to receive,
and (subject to Section 7.1) shall be fully protected in relying upon, an
Opinion of Counsel stating that the execution of such supplemental agreement is

<PAGE>

authorized or permitted by this Agreement. The Agent may, but shall not be
obligated to, enter into any such supplemental agreement which affects the
Agent's own rights, duties or immunities under this Agreement or otherwise.

Section 8.4.      EFFECT OF SUPPLEMENTAL AGREEMENTS.

         Upon the execution of any supplemental agreement under this Article,
this Agreement shall be modified in accordance therewith, and such supplemental
agreement shall form a part of this Agreement for all purposes; and every Holder
of Certificates theretofore or thereafter authenticated, executed on behalf of
the Holders and delivered hereunder, shall be bound thereby.

Section 8.5.      REFERENCE TO SUPPLEMENTAL AGREEMENTS.

         Certificates authenticated, executed on behalf of the Holders and
delivered after the execution of any supplemental agreement pursuant to this
Article may, and shall if required by the Agent, bear a notation in form
approved by the Agent as to any matter provided for in such supplemental
agreement. If the Company shall so determine, new Certificates so modified as to
conform, in the opinion of the Agent and the Company, to any such supplemental
agreement may be prepared and executed by the Company and authenticated,
executed on behalf of the Holders and delivered by the Agent in exchange for
Outstanding Certificates.

                                   ARTICLE IX

                    Consolidation, Merger, Sale or Conveyance

Section 9.1.      COVENANT NOT TO MERGE, CONSOLIDATE, SELL OR CONVEY PROPERTY
                  EXCEPT UNDER CERTAIN CONDITIONS.

         The Company covenants that it will not merge or consolidate with any
other Person or sell, assign, transfer, lease or convey all or substantially all
of its properties and assets to any Person or group of affiliated Persons in one
transaction or a series of related transactions, unless (i) either the Company
shall be the continuing corporation, or the successor (if other than the
Company) shall be a corporation organized and existing under the laws of the
United States of America or a State thereof or the District of Columbia and such
corporation shall expressly assume all the obligations of the Company under the
Purchase Contracts, this Agreement and the Pledge Agreement by one or more
supplemental agreements in form reasonably satisfactory to the Agent and the
Collateral Agent, executed and delivered to the Agent and the Collateral Agent
by such corporation, and (ii) the Company or such successor corporation, as the
case may be, shall not, immediately after such merger or consolidation, or such
sale, assignment, transfer, lease or conveyance, be in default in the
performance of any covenant or condition hereunder, under any of the Securities
or under the Pledge Agreement.

Section 9.2.      RIGHTS AND DUTIES OF SUCCESSOR CORPORATION.

<PAGE>

         In case of any such consolidation, merger, sale, assignment, transfer,
lease or conveyance and upon any such assumption by a successor corporation in
accordance with Section 9.1, such successor corporation shall succeed to and be
substituted for the Company with the same effect as if it had been named herein
as the Company. Such successor corporation thereupon may cause to be signed, and
may issue either in its own name or in the name of Polaroid Corporation, any or
all of the Certificates evidencing Securities issuable hereunder which
theretofore shall not have been signed by the Company and delivered to the
Agent; and, upon the order of such successor corporation, instead of the
Company, and subject to all the terms, conditions and limitations in this
Agreement prescribed, the Agent shall authenticate and execute on behalf of the
Holders and deliver any Certificates which previously shall have been signed and
delivered by the officers of the Company to the Agent for authentication and
execution, and any Certificate evidencing Securities which such successor
corporation thereafter shall cause to be signed and delivered to the Agent for
that purpose. All the Certificates issued shall in all respects have the same
legal rank and benefit under this Agreement as the Certificates theretofore or
thereafter issued in accordance with the terms of this Agreement as though all
of such Certificates had been issued at the date of the execution hereof.

         In case of any such consolidation, merger, sale, assignment, transfer,
lease or conveyance such change in phraseology and form (but not in substance)
may be made in the Certificates evidencing Securities thereafter to be issued as
may be appropriate.

Section 9.3.      OPINION OF COUNSEL GIVEN TO AGENT.

         The Agent, subject to Sections 7.1 and 7.3, shall receive an Opinion of
Counsel as conclusive evidence that any such consolidation, merger, sale,
assignment, transfer, lease or conveyance, and any such assumption, complies
with the provisions of this Article and that all conditions precedent to the
consummation of any such consolidation, merger, sale, assignment, transfer,
lease or conveyance have been met.

                                    ARTICLE X

                                    Covenants

Section 10.1.     PERFORMANCE UNDER PURCHASE CONTRACTS.

         The Company covenants and agrees for the benefit of the Holders from
time to time of the Securities that it will duly and punctually perform its
obligations under the Purchase Contracts in accordance with the terms of the
Purchase Contracts and this Agreement.

Section 10.2.     MAINTENANCE OF OFFICE OR AGENCY.

         The Company will maintain in the Borough of Manhattan, The City of New
York an office or agency where Certificates may be presented or surrendered for
acquisition of shares of Common Stock upon settlement of the Purchase Contracts
on the Purchase Contract Settlement Date or Early Settlement and for transfer of
Collateral upon occurrence of a Termination Event,

<PAGE>

where Certificates may be surrendered for registration of transfer or exchange,
for a Collateral Substitution or re-establishment of a Type A Unit and where
notices and demands to or upon the Company in respect of the Securities and this
Agreement may be served. The Company will give prompt written notice to the
Agent of the location, and any change in the location, of such office or agency.
If at any time the Company shall fail to maintain any such required office or
agency or shall fail to furnish the Agent with the address thereof, such
presentations, surrenders, notices and demands may be made or served at the
Corporate Trust Office, and the Company hereby appoints the Agent as its agent
to receive all such presentations, surrenders, notices and demands.

         The Company may also from time to time designate one or more other
offices or agencies where Certificates may be presented or surrendered for any
or all such purposes and may from time to time rescind such designations;
provided, however, that no such designation or rescission shall in any manner
relieve the Company of its obligation to maintain an office or agency in the
Borough of Manhattan, The City of New York for such purposes. The Company will
give prompt written notice to the Agent of any such designation or rescission
and of any change in the location of any such other office or agency. The
Company hereby designates as the place of payment for the Securities the
Corporate Trust Office and appoints the Agent at its Corporate Trust Office as
paying agent in such city.

Section 10.3.     COMPANY TO RESERVE COMMON STOCK.

         The Company shall at all times prior to the Purchase Contract
Settlement Date reserve and keep available, free from preemptive rights, out of
its authorized but unissued Common Stock the full number of shares of Common
Stock issuable against tender of payment in respect of all Purchase Contracts
constituting a part of the Securities evidenced by Outstanding Certificates.

Section 10.4.     COVENANTS AS TO COMMON STOCK.

         The Company covenants that all shares of Common Stock which may be
issued against tender of payment in respect of any Purchase Contract
constituting a part of the Outstanding Securities will, upon issuance, be duly
authorized, validly issued, fully paid and nonassessable.

Section 10.5.     STATEMENTS OF OFFICERS OF THE COMPANY AS TO DEFAULT.

         The Company will deliver to the Agent, within 120 days after the end of
each fiscal year of the Company (which as of the date hereof is January 2)
ending after the date hereof, an Officers' Certificate (one of the signers of
which shall be the principal executive officer, principal financial officer or
principal accounting officer of the Company), stating whether or not to the best
knowledge of the signers thereof the Company is in default in the performance
and observance of any of the terms, provisions and conditions hereof, and if the
Company shall be in default, specifying all such defaults and the nature and
status thereof of which they may have knowledge.

Section 10.6.     ERISA .

<PAGE>

         Each Holder from time to time of the Type A Units which is a Plan
hereby represents that its acquisition of the Type A Units and the holding of
the same satisfies the applicable fiduciary requirements of ERISA and that it is
entitled to exemption relief from the prohibited transaction provisions of ERISA
and the Code in accordance with one or more prohibited transaction exemptions or
otherwise will not result in a nonexempt prohibited transaction.

          [THE REST OF THIS PAGE HAS BEEN LEFT BLANK INTENTIONALLY; THE
                            SIGNATURE PAGE FOLLOWS:]

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.

                                   POLAROID CORPORATION

                                   By: _______________________________
                                       Name:
                                       Title:

                                   [__________________________], as
                                       Purchase Contract Agent

                                   By: _______________________________
                                       Name:
                                       Title:

<PAGE>

                                                                       EXHIBIT A

                         FACE OF TYPE A UNIT CERTIFICATE

         "THIS CERTIFICATE IS A GLOBAL CERTIFICATE WITHIN THE MEANING OF THE
PURCHASE CONTRACT AGREEMENT HEREINAFTER REFERRED TO AND IS REGISTERED IN THE
NAME OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (THE "DEPOSITARY"),
OR A NOMINEE OF THE DEPOSITARY. THIS CERTIFICATE IS EXCHANGEABLE FOR
CERTIFICATES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS
NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE PURCHASE CONTRACT
AGREEMENT AND NO TRANSFER OF THIS CERTIFICATE (OTHER THAN A TRANSFER OF THIS
CERTIFICATE AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A
NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE
DEPOSITARY) MAY BE REGISTERED EXCEPT IN LIMITED CIRCUMSTANCES.

         UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF
THE DEPOSITARY FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY
CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY (AND ANY PAYMENT
HEREON IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY), ANY TRANSFER, PLEDGE OR OTHER USE
HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL SINCE THE
REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN."

NO. _______                                             CUSIP NO. [____________]
NUMBER OF TYPE A UNITS ________

                              POLAROID CORPORATION
                                   TYPE A UNIT

         This Type A Unit Certificate certifies that Cede & Co. is the
registered Holder of the number of Type A Units set forth above. Each Type A
Unit consists of (i) the beneficial ownership by the Holder of one Debenture
(the "Debenture") of Polaroid Corporation, a Delaware corporation (the
"Company"), having a principal amount of $______, subject to the Pledge of such
Debenture by such Holder pursuant to the Pledge Agreement, and (ii) the rights
and obligations of the Holder under one Purchase Contract with the Company. All
capitalized terms used herein which are defined in the Purchase Contract
Agreement (as defined on the reverse hereof) have the meaning set forth therein.

         Pursuant to the Pledge Agreement, the Debenture constituting part of
each Type A Unit evidenced hereby has been pledged to the Collateral Agent, for
the benefit of the Company, to

                                       A-1

<PAGE>

secure the obligations of the Holder under the Purchase Contract comprising a
portion of such Type A Unit.

         The Pledge Agreement provides that all payments of the principal amount
with respect to any of the Pledged Debentures or cash interest on any Pledged
Debenture (as defined in the Pledge Agreement) constituting part of the Type A
Units received by the Securities Intermediary shall be paid by wire transfer in
same day funds (i) in the case of (A) cash interest with respect to Pledged
Debentures and (B) any payments of the principal amount with respect to any
Debenture or security entitlements thereto that have been released from the
Pledge pursuant to the Pledge Agreement, to the Agent to the account designated
by the Agent, no later than 12:00 p.m., New York City time, on the Business Day
such payment is received by the Securities Intermediary (provided that in the
event such payment is received by the Securities Intermediary on a day that is
not a Business Day or after 12:30 p.m., New York City time, on a Business Day,
then such payment shall be made no later than 10:30 a.m., New York City time, on
the next succeeding Business Day) and (ii) in the case of Proceeds from the
Remarketing with respect to any of the Pledged Debentures or security
entitlements thereto, to the Company on the Purchase Contract Settlement Date
(as described herein) in accordance with the terms of the Pledge Agreement, in
full satisfaction of the respective obligations of the Holders of the Type A
Units of which such Pledged Debenture is a part under the Purchase Contracts
forming a part of such Type A Units. Interest on any Debenture forming part of a
Type A Unit evidenced hereby, which is payable quarterly in arrears on
[_______________], [_______________], [_______________] and [_______________] of
each year, commencing [_______________], [ ] (a "Payment Date"), shall, subject
to receipt thereof by the Agent from the Securities Intermediary, be paid to the
Person in whose name this Type A Unit Certificate (or a Predecessor Type A Unit
Certificate) is registered at the close of business on the Record Date for such
Payment Date.

         Each Purchase Contract evidenced hereby obligates the Holder of this
Type A Unit Certificate to purchase, and the Company to sell, on [__________], [
] the "Purchase Contract Settlement Date"), at a price equal to [$50] (the
"Stated Amount"), a number of Common Shares, par value $1.00 ("Common Stock"),
of the Company, equal to the Settlement Rate, unless on or prior to the Purchase
Contract Settlement Date there shall have occurred a Termination Event or an
Early Settlement with respect to the Type A Unit of which such Purchase Contract
is a part, all as provided in the Purchase Contract Agreement and more fully
described on the reverse hereof. The purchase price (the "Purchase Price") for
the shares of Common Stock purchased pursuant to each Purchase Contract
evidenced hereby, if not paid earlier, shall be paid on the Purchase Contract
Settlement Date by separate cash or by application of payment received, pursuant
to the Remarketing, in respect of the principal amount with respect to any
Pledged Debentures pledged to secure the obligations under such Purchase
Contract of the Holder of the Type A Unit of which such Purchase Contract is a
part.

         The Company shall pay, on each Payment Date, in respect of each
Purchase Contract forming part of a Type A Unit evidenced hereby an amount (the
"Contract Adjustment Payments") equal to (a) if a Reset Transaction has not
occurred, [___]% per annum of the Stated Amount or (b) following the occurrence
of a Reset Transaction, the Adjusted Contract Adjustment Payment Rate related to
such Reset Transaction until any such succeeding Reset Transaction shall occur
(computed on the basis of (i) for any full quarterly period, a 360-day year

                                       A-2

<PAGE>

of twelve 30-day months and (ii) for any period shorter than a full quarterly
period, a 30-day month and for periods less than a month, the actual number of
days elapsed per 30-day period). Such Contract Adjustment Payments shall be
payable to the Person in whose name this Type A Unit Certificate (or a
Predecessor Type A Unit Certificate) is registered at the close of business on
the Record Date for such Payment Date.

         Interest on the Debentures and Contract Adjustment Payments will be
payable at the office of the Agent in The City of New York or, at the option of
the Company, by check mailed to the address of the Person entitled thereto as
such address appears on the Type A Units Register.

         Reference is hereby made to the further provisions set forth on the
reverse hereof, which further provisions shall for all purposes have the same
effect as if set forth at this place.

         Unless the certificate of authentication hereon has been executed by
the Agent by manual signature, this Type A Unit Certificate shall not be
entitled to any benefit under the Pledge Agreement or the Purchase Contract
Agreement or be valid or obligatory for any purpose.

                                       A-3

<PAGE>

         IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed.

                                   POLAROID CORPORATION

                                   By:      _______________________________
                                            Name:
                                            Title:

                                   By:      _______________________________
                                            Name:
                                            Title:

                                   HOLDER SPECIFIED ABOVE (as to
                                   obligations of such Holder under the Purchase
                                   Contracts evidenced hereby)

                                   By:     [_____________________________]
                                            not individually but solely as
                                           Attorney-in-Fact of such Holder

                                   By:     _______________________________
                                           Name:
                                           Title:

Dated:

                                       AGENT'S CERTIFICATE OF AUTHENTICATION

        This is one of the Type A Unit Certificates referred to in the within
mentioned Purchase Contract Agreement.

                                   By:     [______________________________]
                                           as Purchase Contract Agent

                                   By:     _______________________________
                                                      Authorized Officer
                  (FORM OF REVERSE OF TYPE A UNIT CERTIFICATE)

                                       A-4

<PAGE>

        Each Purchase Contract evidenced hereby is governed by a Purchase
Contract Agreement, dated as of [_______________], 1999 (as may be supplemented
from time to time, the "Purchase Contract Agreement"), between the Company and
[_______________________________], as Purchase Contract Agent (including its
successors hereunder, the "Agent"), to which Purchase Contract Agreement and
supplemental agreements thereto reference is hereby made for a description of
the respective rights, limitations of rights, obligations, duties and immunities
thereunder of the Agent, the Company, and the Holders and of the terms upon
which the Type A Unit Certificates are, and are to be, executed and delivered.

        Each Purchase Contract evidenced hereby obligates the Holder of this
Type A Unit Certificate to purchase, and the Company to sell, on the Purchase
Contract Settlement Date at a price equal to the Stated Amount (the "Purchase
Price"), a number of shares of Common Stock of the Company equal to the
Settlement Rate, unless, on or prior to the Purchase Contract Settlement Date,
there shall have occurred a Termination Event with respect to the Security of
which such Purchase Contract is a part or an Early Settlement shall have
occurred. The "Settlement Rate" is equal to (a) if the Applicable Market Value
(as defined below) is equal to or greater than $[_______] (the "Threshold
Appreciation Price"), [__________] shares of Common Stock per Purchase Contract,
(b) if the Applicable Market Value is less than the Threshold Appreciation Price
but is greater than $[_______] the number of shares of Common Stock per Purchase
Contract equal to the Stated Amount divided by the Applicable Market Value and
(c) if the Applicable Market Amount is less than or equal to $[________],
[________] shares of Common Stock per Purchase Contract, in each case subject to
adjustment as provided in the Purchase Contract Agreement. No fractional shares
of Common Stock will be issued upon settlement of Purchase Contracts, as
provided in the Purchase Contract Agreement.

        Each Purchase Contract evidenced hereby, which is settled either through
Early Settlement or Cash Settlement, shall obligate the Holder of the related
Type A Units to purchase at the Purchase Price, and the Company to sell, a
number of newly issued shares of Common Stock equal to the Early Settlement Rate
or the Settlement Rate, as applicable.

        The "Applicable Market Value" means the average of the Closing Price per
share of Common Stock on each of the 20 Trading Days ending on the third Trading
Day immediately preceding the Purchase Contract Settlement Date. The "Closing
Price" of the Common Stock on any date of determination means (i) the closing
sale price (or, if no closing price is reported, the last reported sale price)
of the Common Stock on the New York Stock Exchange (the "NYSE") on such date,
(ii) if the Common Stock is not listed for trading on the NYSE on any such date,
the closing sale price as reported in the composite transactions for the
principal United States securities exchange on which the Common Stock is so
listed, (iii) if the Common Stock is not so listed on a United States national
or regional securities exchange, the closing sale price as reported by The
Nasdaq Stock Market, (iv) if the Common Stock is not so reported, the last
quoted bid price for the Common Stock in the over-the-counter market as reported
by the National Quotation Bureau or similar organization, or (v) if such bid
price is not available, the average of the mid-point of the last bid and ask
prices of the Common Stock on such date from at least three nationally
recognized independent investment banking firms retained for this purpose by the
Company. A "Trading Day" means a day on which the Common Stock (A) is not

                                       A-5

<PAGE>

suspended from trading on any national or regional securities exchange or
association or over-the-counter market at the close of business and (B) has
traded at least once on the national or regional securities exchange or
association or over-the-counter market that is the primary market for the
trading of the Common Stock.

        In accordance with the terms of the Purchase Contract Agreement, the
Holder of this Type A Unit Certificate may pay the Purchase Price for the shares
of Common Stock purchased pursuant to each Purchase Contract evidenced hereby by
effecting a Cash Settlement or an Early Settlement or a remarketing of the
related Pledged Debentures. A Holder of Type A Units who does not effect, on or
prior to 11:00 a.m. New York City time on the fifth Business Day immediately
preceding the Purchase Contract Settlement Date, an effective Cash Settlement or
an Early Settlement, shall pay the Purchase Price for the shares of Common Stock
to be issued under the related Purchase Contract from the proceeds of the sale
of the related Pledged Debentures held by the Collateral Agent. Such sale will
be made by the Remarketing Agent pursuant to the terms of the Remarketing
Agreement on the third Business Day prior to the Purchase Contract Settlement
Date. If, as provided in the Purchase Contract Agreement, upon the occurrence of
a Failed Remarketing the Collateral Agent, for the benefit of the Company,
exercises its rights as a secured creditor with respect to the Pledged
Debentures related to this Type A Unit Certificate, any accrued and unpaid
interest on such Pledged Debentures will become payable by the Company to the
holder of this Type A Unit Certificate in the manner provided for in the
Purchase Contract Agreement.

        The Company shall not be obligated to issue any shares of Common Stock
in respect of a Purchase Contract or deliver any certificates therefor to the
Holder unless it shall have received payment of the aggregate purchase price for
the shares of Common Stock to be purchased thereunder in the manner herein set
forth.

        Each Purchase Contract evidenced hereby and all obligations and rights
of the Company and the Holder thereunder shall terminate if a Termination Event
shall occur. Upon the occurrence of a Termination Event, the Company shall give
written notice to the Agent and to the Holders, at their addresses as they
appear in the Type A Units Register. Upon and after the occurrence of a
Termination Event, the Collateral Agent shall release the Pledged Debenture
forming a part of each Type A Unit from the Pledge. A Type A Unit shall
thereafter represent the right to receive the Debenture forming a part of such
Type A Unit in accordance with the terms of the Purchase Contract Agreement and
the Pledge Agreement.

        Under the terms of the Pledge Agreement, the Agent will be entitled to
exercise the voting and any other consensual rights pertaining to the Pledged
Debentures. Upon receipt of notice of any meeting at which holders of Debentures
are entitled to vote or upon the solicitation of consents, waivers or proxies of
holders of Debentures, the Agent shall, as soon as practicable thereafter, mail
to the Type A Unit Holders a notice (a) containing such information as is
contained in the notice or solicitation, (b) stating that each Type A Unit
Holder on the record date set by the Agent therefor (which, to the extent
possible, shall be the same date as the record date for determining the holders
of Debentures entitled to vote) shall be entitled to instruct the Agent as to
the exercise of the voting rights pertaining to the Debentures constituting a
part of such Holder's Type A Units and (c) stating the manner in which such
instructions may be given.

                                       A-6

<PAGE>

Upon the written request of the Type A Unit Holders on such record date, the
Agent shall endeavor insofar as practicable to vote or cause to be voted, in
accordance with the instructions set forth in such requests, the maximum
aggregate principal amount of Debentures as to which any particular voting
instructions are received. In the absence of specific instructions from the
Holder of a Type A Unit, the Agent shall abstain from voting the Debentures
evidenced by such Type A Unit.

        The Type A Unit Certificates are issuable only in registered form and
only in denominations of a single Type A Unit and any integral multiple thereof.
The transfer of any Type A Unit Certificate will be registered and Type A Unit
Certificates may be exchanged as provided in the Purchase Contract Agreement.
The Type A Units Registrar may require a Holder, among other things, to furnish
appropriate endorsements and transfer documents permitted by the Purchase
Contract Agreement. No service charge shall be required for any such
registration of transfer or exchange, but the Company and the Agent may require
payment of a sum sufficient to cover any tax or other governmental charge
payable in connection therewith. A holder who elects to substitute a Treasury
Security for Debentures, thereby creating Type B Units, shall be responsible for
any fees or expenses payable in connection therewith. Except as provided in the
Purchase Contract Agreement, for so long as the Purchase Contract underlying a
Type A Unit remains in effect, such Type A Unit shall not be separable into its
constituent parts, and the rights and obligations of the Holder of such Type A
Unit in respect of the Debenture and Purchase Contract constituting such Type A
Unit may be transferred and exchanged only as a Type A Unit. The holder of a
Type A Unit may substitute for the Pledged Debentures securing its obligation
under the related Purchase Contract Treasury Securities in an aggregate
principal amount equal to the aggregate principal amount of the Pledged
Debentures in accordance with the terms of the Purchase Contract Agreement and
the Pledge Agreement. From and after such Collateral Substitution, the Security
for which such Pledged Treasury Securities secures the holder's obligation under
the Purchase Contract shall be referred to as a "Type B Unit." A Holder may make
such Collateral Substitution only in integral multiples of 20 Type A Units for
20 Type B Units. Such Collateral Substitution may cause the equivalent aggregate
principal amount of this Certificate to be increased or decreased; PROVIDED,
HOWEVER, this Type A Unit Certificate shall not represent more than ____ Type A
Units. All such adjustments to the equivalent aggregate principal amount of this
Type A Unit Certificate shall be duly recorded by placing an appropriate
notation on the Schedule attached hereto.

        A Holder of Type B Units may recreate Type A Units by delivering to the
Securities Intermediary Debentures with an aggregate principal amount equal to
the aggregate principal amount of the Pledged Treasury Securities in exchange
for the release of such Pledged Treasury Securities in accordance with the terms
of the Purchase Contract Agreement and the Pledge Agreement.

        The Company shall pay, on each Payment Date, the Contract Adjustment
Payments payable in respect of each Purchase Contract to the Person in whose
name the Type A Unit Certificate evidencing such Purchase Contract is registered
at the close of business on the Record Date for such Payment Date. Contract
Adjustment Payments will be payable at the office of the Agent in The City of
New York or, at the option of the Company, by check mailed to the address of the
Person entitled thereto at such address as it appears on the Type A Units
Register.

                                       A-7

<PAGE>

        The Purchase Contracts and all obligations and rights of the Company and
the Holders thereunder, including, without limitation, the rights of the Holders
to receive and the obligation of the Company to pay any Contract Adjustment
Payments, shall immediately and automatically terminate, without the necessity
of any notice or action by any Holder, the Agent or the Company, if, on or prior
to the Purchase Contract Settlement Date, a Termination Event shall have
occurred. Upon the occurrence of a Termination Event, the Company shall promptly
but in no event later than two Business Days thereafter give written notice to
the Agent, the Collateral Agent and the Holders, at their addresses as they
appear in the Type A Units Register. Upon and after the occurrence of a
Termination Event, the Collateral Agent shall release the Debentures from the
Pledge in accordance with the provisions of the Pledge Agreement.

        Subject to and upon compliance with the provisions of the Purchase
Contract Agreement, at the option of the Holder thereof, Purchase Contracts
underlying Securities may be settled early ("Early Settlement") as provided in
the Purchase Contract Agreement. In order to exercise the right to effect Early
Settlement with respect to any Purchase Contracts evidenced by this Type A Unit
Certificate, the Holder of this Type A Unit Certificate shall deliver this Type
A Unit Certificate to the Agent at the Corporate Trust Office duly endorsed for
transfer to the Company or in blank with the form of Election to Settle Early
set forth below duly completed and accompanied by payment in the form of
immediately available funds payable to the order of the Company in an amount
(the "Early Settlement Amount") equal to (i) the product of (A) the Stated
Amount times (B) the number of Purchase Contracts with respect to which the
Holder has elected to effect Early Settlement, plus (ii) if such delivery is
made with respect to any Purchase Contracts during the period from the close of
business on any Record Date for any Payment Date to the opening of business on
such Payment Date, an amount equal to the Contract Adjustment Payments payable
on such Payment Date with respect to such Purchase Contracts. Upon Early
Settlement of Purchase Contracts by a Holder of the related Securities, the
Pledged Debentures underlying such Securities shall be released from the Pledge
as provided in the Pledge Agreement and the Holder shall be entitled to receive
a number of shares of Common Stock on account of each Purchase Contract forming
part of a Type A Unit as to which Early Settlement is effected equal to the
Early Settlement Rate. The Early Settlement Rate shall initially be equal
to[_______] shares of Common Stock and shall be adjusted in the same manner and
at the same time as the Settlement Rate is adjusted as provided in the Purchase
Contract Agreement.

        Upon registration of transfer of this Type A Unit Certificate, the
transferee shall be bound (without the necessity of any other action on the part
of such transferee, except as may be required by the Agent pursuant to the
Purchase Contract Agreement), under the terms of the Purchase Contract Agreement
and the Purchase Contracts evidenced hereby and the transferor shall be released
from the obligations under the Purchase Contracts evidenced by this Type A Unit
Certificate. The Company covenants and agrees, and the Holder, by its acceptance
hereof, likewise covenants and agrees, to be bound by the provisions of this
paragraph.

        The Holder of this Type A Unit Certificate, by its acceptance hereof,
authorizes the Agent to enter into and perform the related Purchase Contracts
forming part of the Type A Units evidenced hereby on its behalf as its
attorney-in-fact, expressly withholds any consent to the assumption (i.e.,
affirmance) of the Purchase Contracts by the Company or its trustee in the event
that the Company becomes the subject of a case under the Bankruptcy Code, agrees
to be bound

                                       A-8

<PAGE>

by the terms and provisions thereof, covenants and agrees to perform his
obligations under such Purchase Contracts, consents to the provisions of the
Purchase Contract Agreement, authorizes the Agent to enter into and perform the
Purchase Contract Agreement and the Pledge Agreement on its behalf as its
attorney-in-fact, and consents to the Pledge of the Debentures underlying this
Type A Unit Certificate pursuant to the Pledge Agreement. The Holder further
covenants and agrees that, to the extent and in the manner provided in the
Purchase Contract Agreement and the Pledge Agreement, but subject to the terms
thereof, Proceeds from the Remarketing with respect to any of the Pledged
Debentures or security entitlements thereto in respect of the aggregate
principal amount of the Pledged Debentures on the Purchase Contract Settlement
Date shall be paid by the Collateral Agent to the Company in satisfaction of
such Holder's obligations under such Purchase Contract and such Holder shall
acquire no right, title or interest in such payments.

        Subject to certain exceptions, the provisions of the Purchase Contract
Agreement may be amended with the consent of the Holders of a majority of the
Purchase Contracts.

        The Purchase Contracts shall for all purposes be governed by, and
construed in accordance with, the laws of the State of New York.

        The Company, the Agent and its Affiliates and any agent of the Company
or the Agent may treat the Person in whose name this Type A Unit Certificate is
registered as the owner of the Type A Units evidenced hereby for the purpose of
receiving payments of interest payable quarterly on the Debentures, receiving
payments of Contract Adjustment Payments, performance of the Purchase Contracts
and for all other purposes whatsoever, whether or not any payments in respect
thereof be overdue and notwithstanding any notice to the contrary, and neither
the Company, the Agent nor any such agent shall be affected by notice to the
contrary.

        The Purchase Contracts shall not, prior to the settlement thereof,
entitle the Holder to any of the rights of a holder of shares of Common Stock.

        A copy of the Purchase Contract Agreement is available for inspection at
the offices of the Agent.

                                       A-9

<PAGE>

                                  ABBREVIATIONS

        The following abbreviations, when used in the inscription on the face of
this instrument, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM -                          as tenants in common
UNIF GIFT MIN ACT -                ---------------Custodian---------------
                                   (cust)                           (minor)

                                   Under Uniform Gifts to Minors Act of _______
                                   ____________________________________________

TEN ENT -                          as tenants by the entireties

JT TEN -                           as joint tenants with right of survivorship
                                   and not as tenants in common

Additional abbreviations may also be used though not in the above list.
                            -------------------------

                  FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s)
and transfer(s) unto  _________________________________________________________

 (Please insert Social Security or Taxpayer I.D. or other Identifying Number of
                                    Assignee)
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________

     (Please Print or Type Name and Address Including Postal Zip Code of
Assignee) the within Type A Unit Certificates and all rights thereunder,
hereby irrevocably constituting and appointing ______________________
attorney to transfer said Type A Unit Certificates on the books of Polaroid
Corporation with full power of substitution in the premises.

Dated: ___________________         _____________________________________________
                                   Signature

                                   NOTICE: The signature to this assignment must
                                   correspond with the name as it appears upon
                                   the face of the within Type A Unit
                                   Certificates in every particular, without
                                   alteration or enlargement or any change
                                   whatsoever.

Signature Guarantee: ___________________________________

                                      A-10

<PAGE>

                             SETTLEMENT INSTRUCTIONS

        The undersigned Holder directs that a certificate for shares of Common
Stock deliverable upon settlement on or after the Purchase Contract Settlement
Date of the Purchase Contracts underlying the number of Type A Units evidenced
by this Type A Unit Certificate be registered in the name of, and delivered,
together with a check in payment for any fractional share, to the undersigned at
the address indicated below unless a different name and address have been
indicated below. If shares are to be registered in the name of a Person other
than the undersigned, the undersigned will pay any transfer tax payable incident
thereto.

<TABLE>

<S>                                      <C>
Dated: _______________________           _____________________________________
                                         Signature
                                         Signature Guarantee: _________________
                                         (if assigned to another person)
If shares are to be registered in the
name of and delivered to a Person other    REGISTERED HOLDER
than the Holder, please (i) print such
Person's name and address and (ii)
provide a guarantee of your signature:
                                           Please print name and
                                           address of Registered
                                           Holder:

-------------------------------------      -------------------------------------
                           Name                                      Name

-------------------------------------      -------------------------------------
                          Address                                   Address

-------------------------------------      -------------------------------------

-------------------------------------      -------------------------------------

-------------------------------------      -------------------------------------

Social Security or other
Taxpayer Identification                    _____________________________________
Number, if any

</TABLE>

                                      A-11

<PAGE>

                            ELECTION TO SETTLE EARLY

        The undersigned Holder of this Type A Unit Certificate hereby
irrevocably exercises the option to effect Early Settlement in accordance with
the terms of the Purchase Contract Agreement with respect to the Purchase
Contracts underlying the number of Type A Units evidenced by this Type A Unit
Certificate specified below. The undersigned Holder directs that a certificate
for shares of Common Stock deliverable upon such Early Settlement be registered
in the name of, and delivered, together with a check in payment for any
fractional share and any Type A Unit Certificate representing any Type A Units
evidenced hereby as to which Early Settlement of the related Purchase Contracts
is not effected, to the undersigned at the address indicated below unless a
different name and address have been indicated below. Pledged Debentures
deliverable upon such Early Settlement will be transferred in accordance with
the transfer instructions set forth below. If shares are to be registered in the
name of a Person other than the undersigned, the undersigned will pay any
transfer tax payable incident thereto.

Dated: ______________________              _____________________________________
                                                          Signature

Signature Guarantee: _____________________________________

                                      A-12

<PAGE>

        Number of Securities evidenced hereby as to which Early Settlement of
the related Purchase Contracts is being elected:

<TABLE>

<S>                                         <C>
If shares of Common Stock or Type A Unit      REGISTERED HOLDER
Certificates are to be registered in the
name of and delivered to, and Pledged
Debentures are to be transferred to, a
Person other than the Holder, please print
such Person's name and address:
                                              Please print name and
                                              address of Registered
                                              Holder:

-------------------------------------         -------------------------------------
                           Name                                         Name

-------------------------------------         -------------------------------------
                          Address                                      Address

-------------------------------------         -------------------------------------

-------------------------------------         -------------------------------------

-------------------------------------         -------------------------------------

Social Security or other
Taxpayer Identification
Number, if any                                _____________________________________

</TABLE>

                                      A-13

<PAGE>

Transfer Instructions for Pledged Debentures Transferable Upon Early Settlement
or a Termination Event:

------------------------------------------------------------------------------

------------------------------------------------------------------------------

------------------------------------------------------------------------------

                                      A-14

<PAGE>

                     [TO BE ATTACHED TO GLOBAL CERTIFICATES]

            SCHEDULE OF INCREASES OR DECREASES IN GLOBAL CERTIFICATE

               The following increases or decreases in this Global
                          Certificate have been made:

<TABLE>
<CAPTION>
=======================  =======================  ======================  =======================  ======================
                                                                              Number of UNITS
                          Amount of decrease in   Amount of increase in      evidenced by this
                             Number of UNITS         Number of UNITS        Global Certificate     Signature of authorized
                            evidenced by the         evidenced by the         following such       officer of Trustee or
         Date              Global Certificate       Global Certificate     decrease or increase     Securities Custodian
<S>                      <C>                      <C>                     <C>                      <C>

=======================  =======================  ======================  =======================  ======================

</TABLE>

                                      A-15

<PAGE>

                                                                       EXHIBIT B

                         FACE OF TYPE B UNIT CERTIFICATE

        "THIS CERTIFICATE IS A GLOBAL CERTIFICATE WITHIN THE MEANING OF THE
PURCHASE CONTRACT AGREEMENT HEREINAFTER REFERRED TO AND IS REGISTERED IN THE
NAME OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (THE "DEPOSITARY"),
OR A NOMINEE OF THE DEPOSITARY. THIS CERTIFICATE IS EXCHANGEABLE FOR
CERTIFICATES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS
NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE PURCHASE CONTRACT
AGREEMENT AND NO TRANSFER OF THIS CERTIFICATE (OTHER THAN A TRANSFER OF THIS
CERTIFICATE AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A
NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE
DEPOSITARY) MAY BE REGISTERED EXCEPT IN LIMITED CIRCUMSTANCES.

        UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF
THE DEPOSITARY FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY
CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY (AND ANY PAYMENT
HEREON IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY), ANY TRANSFER, PLEDGE OR OTHER USE
HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL SINCE THE
REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN."

NO.  _____                                               CUSIP NO. [___________]
NUMBER OF TYPE B UNITS _________

                              POLAROID CORPORATION
                                   TYPE B UNIT

        This Type B Unit Certificate certifies that Cede & Co. is the registered
Holder of the number of Type B Units set forth above. Each Type B Unit consists
of (i) a 1/20 undivided beneficial ownership interest of a Treasury Security
having a principal amount at maturity equal to $1,000, subject to the Pledge of
such Treasury Security by such Holder pursuant to the Pledge Agreement, and (ii)
the rights and obligations of the Holder under one Purchase Contract with
Polaroid Corporation, a Delaware corporation (the "Company"). All capitalized
terms used herein which are defined in the Purchase Contract Agreement (as
defined on the reverse hereof) have the meaning set forth therein.

<PAGE>

        Pursuant to the Pledge Agreement, the Treasury Securities constituting
part of each Type B Unit evidenced hereby have been pledged to the Collateral
Agent, for the benefit of the Company, to secure the obligations of the Holder
under the Purchase Contract comprising a portion of such Type B Unit.

        Each Purchase Contract evidenced hereby obligates the Holder of this
Type B Unit Certificate to purchase, and the Company, to sell, on
[____________], [ ] (the "Purchase Contract Settlement Date"), at a price equal
to $[50] in cash (the "Stated Amount"), a number of Common Shares, par value
$1.00 ("Common Stock"), of the Company equal to the Settlement Rate, unless on
or prior to the Purchase Contract Settlement Date there shall have occurred a
Termination Event or an Early Settlement with respect to the Type B Unit of
which such Purchase Contract is a part, all as provided in the Purchase Contract
Agreement and more fully described on the reverse hereof. The purchase price for
the shares of Common Stock purchased pursuant to each Purchase Contract
evidenced hereby, if not paid earlier, shall be paid on the Purchase Contract
Settlement Date by application of the Proceeds from the Treasury Securities
pledged to secure the obligations under such Purchase Contract in accordance
with the terms of the Pledge Agreement.

        The Company shall pay on each Payment Date in respect of each Purchase
Contract evidenced hereby an amount (the "Contract Adjustment Payments") equal
to (a) if a Reset Transaction has not occurred, [____]% per annum of the Stated
Amount or (b) following the occurrence of a Reset Transaction, the Adjusted
Contract Adjustment Payment Rate related to such Reset Transaction until any
such succeeding Reset Transaction shall occur (computed on the basis of (i) for
any full quarterly period, a 360-day year of twelve 30-day months and (ii) for
any period shorter than a full quarterly period, a 30-day month and for periods
less than a month, the actual number of days elapsed per 30-day period), as the
case may be. Such Contract Adjustment Payments shall be payable to the Person in
whose name this Type B Unit Certificate (or a Predecessor Type B Unit
Certificate) is registered at the close of business on the Record Date for such
Payment Date.

        Contract Adjustment Payments will be payable at the office of the Agent
in The City of New York or, at the option of the Company, by check mailed to the
address of the Person entitled thereto as such address appears on the Type B
Units Register.

        Reference is hereby made to the further provisions set forth on the
reverse hereof, which further provisions shall for all purposes have the same
effect as if set forth at this place.

        Unless the certificate of authentication hereon has been executed by the
Agent by manual signature, this Type B Unit Certificate shall not be entitled to
any benefit under the Pledge Agreement or the Purchase Contract Agreement or be
valid or obligatory for any purpose.

                                       B-2

<PAGE>

        IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed.

                              POLAROID CORPORATION

                                         By:     _______________________________
                                                 Name:
                                                 Title:

                                         By:     _______________________________
                                                 Name:
                                                 Title:

                                         HOLDER SPECIFIED ABOVE (as to
                                         obligations of such Holder under the
                                         Purchase Contracts)

                                         By:     [___________________________],
                                                 not individually but solely as
                                                 Attorney-in-Fact of such Holder

                                         By:     _______________________________
                                                 Name:
                                                 Title:

Dated:

                                       B-3

<PAGE>

                      AGENT'S CERTIFICATE OF AUTHENTICATION

        This is one of the Type B Units referred to in the within-mentioned
Purchase Contract Agreement.

                                 By:     [_______________________],  as Purchase
                                         Contract Agent

                                 By:     ____________________________
                                              Authorized Officer

                                       B-4

<PAGE>

                      (REVERSE OF TYPE B UNIT CERTIFICATE)

        Each Purchase Contract evidenced hereby is governed by a Purchase
Contract Agreement, dated as of [______________], 1999 (as may be supplemented
from time to time, the "Purchase Contract Agreement") between the Company and
[_____________________], as Purchase Contract Agent (including its successors
thereunder, herein called the "Agent"), to which the Purchase Contract Agreement
and supplemental agreements thereto reference is hereby made for a description
of the respective rights, limitations of rights, obligations, duties and
immunities thereunder of the Agent, the Company and the Holders and of the terms
upon which the Type B Unit Certificates are, and are to be, executed and
delivered.

        Each Purchase Contract evidenced hereby obligates the Holder of this
Type B Unit Certificate to purchase, and the Company to sell, on the Purchase
Contract Settlement Date at a price equal to the Stated Amount (the "Purchase
Price") a number of shares of Common Stock of the Company equal to the
Settlement Rate, unless on or prior to the Purchase Contract Settlement Date,
there shall have occurred a Termination Event with respect to the Security of
which such Purchase Contract is a part or an Early Settlement shall have
occurred. The "Settlement Rate" is equal to (a) if the Applicable Market Value
(as defined below) is equal to or greater than $[_________] (the "Threshold
Appreciation Price"), [_________] shares of Common Stock per Purchase Contract,
(b) if the Applicable Market Value is less than the Threshold Appreciation Price
but is greater than $[_________], the number of shares of Common Stock per
Purchase Contract equal to the Stated Amount divided by the Applicable Market
Value and (c) if the Applicable Market Amount is less than or equal to
$[_________], then [_________] shares of Common Stock per Purchase Contract, in
each case subject to adjustment as provided in the Purchase Contract Agreement.
No fractional shares of Common Stock will be issued upon settlement of Purchase
Contracts, as provided in the Purchase Contract Agreement.

        Each Purchase Contract evidenced hereby, which is settled either through
Early Settlement or Cash Settlement, shall obligate the Holder of the related
Type B Units to purchase at the Purchase Price for cash, and the Company to
sell, a number of newly issued shares of Common Stock equal to the Early
Settlement Rate or the Settlement Rate, as applicable.

        The "Applicable Market Value" means the average of the Closing Prices
per share of Common Stock on each of the 20 Trading Days ending on the third
Trading Day immediately preceding the Purchase Contract Settlement Date. The
"Closing Price" of the Common Stock on any date of determination means the (i)
closing sale price (or, if no closing price is reported, the last reported sale
price) of the Common Stock on the New York Stock Exchange (the "NYSE") on such
date, (ii) if the Common Stock is not listed for trading on the NYSE on any such
date, the closing sale price as reported in the composite transactions for the
principal United States securities exchange on which the Common Stock is so
listed, (iii) if the Common Stock is not so listed on a United States national
or regional securities exchange, the closing sale price as reported by The
Nasdaq Stock Market, (iv) if the Common Stock is not so reported, the last
quoted bid price for the Common Stock in the over-the-counter market as reported
by the National Quotation Bureau or similar organization, or (v) if such bid
price is not available, the

                                       B-5

<PAGE>

average of the mid-point of the last bid and ask prices of the Common Stock on
such date from at least three nationally recognized independent investment
banking firms retained for this purpose by the Company. A "Trading Day" means a
day on which the Common Stock (A) is not suspended from trading on any national
or regional securities exchange or association or over-the-counter market at the
close of business and (B) has traded at least once on the national or regional
securities exchange or association or over-the-counter market that is the
primary market for the trading of the Common Stock.

        In accordance with the terms of the Purchase Contract Agreement, the
Holder of this Type B Unit shall pay the Purchase Price for the shares of Common
Stock purchased pursuant to each Purchase Contract evidenced hereby either by
effecting a Cash Settlement or an Early Settlement of each such Purchase
Contract or by applying a principal amount of the Pledged Treasury Securities
underlying such Holder's Type B Units equal to the Stated Amount of such
Purchase Contract to the purchase of the Common Stock. A Holder of Type B Units
who does not effect, on or prior to 11:00 a.m. New York City time on the
Business Day immediately preceding the Purchase Contract Settlement Date, an
effective Cash Settlement or an Early Settlement, shall pay the Purchase Price
for the shares of Common Stock to be issued under the related Purchase Contract
from the proceeds of the Pledged Treasury Securities.

        The Company shall not be obligated to issue any shares of Common Stock
in respect of a Purchase Contract or deliver any certificates therefor to the
Holder unless it shall have received payment of the aggregate purchase price for
the shares of Common Stock to be purchased thereunder in the manner herein set
forth.

        Each Purchase Contract evidenced hereby and all obligations and rights
of the Company and the Holder thereunder shall terminate if a Termination Event
shall occur. Upon the occurrence of a Termination Event, the Company shall give
written notice to the Agent and to the Holders, at their addresses as they
appear in the Type B Units Register. Upon and after the occurrence of a
Termination Event, the Collateral Agent shall release the Pledged Treasury
Securities (as defined in the Pledge Agreement) forming a part of each Type B
Unit. A Type B Unit shall thereafter represent the right to receive the interest
in the Treasury Security forming a part of such Type B Unit, in accordance with
the terms of the Purchase Contract Agreement and the Pledge Agreement.

        The Type B Unit Certificates are issuable only in registered form and
only in denominations of a single Type B Unit and any integral multiple thereof.
The transfer of any Type B Unit Certificate will be registered and Type B Unit
Certificates may be exchanged as provided in the Purchase Contract Agreement.
The Type B Units Registrar may require a Holder, among other things, to furnish
appropriate endorsements and transfer documents permitted by the Purchase
Contract Agreement. No service charge shall be required for any such
registration of transfer or exchange, but the Company and the Agent may require
payment of a sum sufficient to cover any tax or other governmental charge
payable in connection therewith. A Holder who elects to substitute Debentures
for Treasury Securities, thereby recreating Type A Units, shall be responsible
for any fees or expenses associated therewith. Except as provided in

                                       B-6

<PAGE>

the Purchase Contract Agreement, for so long as the Purchase Contract underlying
a Type B Unit remains in effect, such Type B Unit shall not be separable into
its constituent parts, and the rights and obligations of the Holder of such Type
B Unit in respect of the Treasury Security and the Purchase Contract
constituting such Type B Unit may be transferred and exchanged only as a Type B
Unit. A Holder of Type B Units may recreate Type A Units by delivering to the
Collateral Agent Debentures with a principal amount equal to the aggregate
principal amount at maturity of the Pledged Treasury Securities in exchange for
the release of such Pledged Treasury Securities in accordance with the terms of
the Purchase Contract Agreement and the Pledge Agreement. From and after such
substitution, the Holder's Security shall be referred to as a "Type A Unit."
Such substitution may cause the equivalent aggregate principal amount of this
Certificate to be increased or decreased; PROVIDED, HOWEVER, this Type B Unit
Certificate shall not represent more than ____ Type B Units. All such
adjustments to the equivalent aggregate principal amount of this Type B Unit
Certificate shall be duly recorded by placing an appropriate notation on the
Schedule attached hereto.

        A Holder of a Type A Unit may recreate a Type B Unit by delivering to
the Collateral Agent Treasury Securities in an aggregate principal amount equal
to the aggregate principal amount at maturity of the Pledged Debentures in
exchange for the release of such Pledged Debentures in accordance with the terms
of the Purchase Contract Agreement and the Pledge Agreement. Any such recreation
of a Type B Unit may be effected only in multiples of 20 Type A Units for 20
Type B Units.

        The Company shall pay, on each Payment Date, the Contract Adjustment
Payments payable in respect of each Purchase Contract to the Person in whose
name the Type B Unit Certificate evidencing such Purchase Contract is registered
at the close of business on the Record Date for such Payment Date. Contract
Adjustment Payments will be payable at the office of the Agent in The City of
New York or, at the option of the Company, by check mailed to the address of the
Person entitled thereto at such address as it appears on the Type B Units
Register.

        The Purchase Contracts and all obligations and rights of the Company and
the Holders thereunder, including, without limitation, the rights of the Holders
to receive and the obligation of the Company to pay Contract Adjustment
Payments, shall immediately and automatically terminate, without the necessity
of any notice or action by any Holder, the Agent or the Company, if, on or prior
to the Purchase Contract Settlement Date, a Termination Event shall have
occurred. Upon the occurrence of a Termination Event, the Company shall promptly
but in no event later than two Business Days thereafter give written notice to
the Agent, the Collateral Agent and the Holders, at their addresses as they
appear in the Type B Units Register. Upon the occurrence of a Termination Event,
the Collateral Agent shall release the Treasury Securities from the Pledge in
accordance with the provisions of the Pledge Agreement.

        Subject to and upon compliance with the provisions of the Purchase
Contract Agreement, at the option of the Holder thereof, Purchase Contracts
underlying Securities may be settled early ("Early Settlement") as provided in
the Purchase Contract Agreement. In order to exercise the right to effect Early
Settlement with respect to any Purchase Contracts evidenced by this Type B

                                       B-7

<PAGE>

Unit the Holder of this Type B Unit Certificate shall deliver this Type B Unit
Certificate to the Agent at the Corporate Trust Office duly endorsed for
transfer to the Company or in blank with the form of Election to Settle Early
set forth below duly completed and accompanied by payment in the form of
immediately available funds payable to the order of the Company in an amount
(the "Early Settlement Amount") equal to (i) the product of (A) $50 times (B)
the number of Purchase Contracts with respect to which the Holder has elected to
effect Early Settlement, plus (ii) if such delivery is made with respect to any
Purchase Contracts during the period from the close of business on any Record
Date for any Payment Date to the opening of business on such Payment Date, an
amount equal to the Contract Adjustment Payments payable, if any, on such
Payment Date with respect to such Purchase Contracts. Upon Early Settlement of
Purchase Contracts by a Holder of the related Securities, the Pledged Treasury
Securities underlying such Securities shall be released from the Pledge as
provided in the Pledge Agreement and the Holder shall be entitled to receive a
number of shares of Common Stock on account of each Purchase Contract forming
part of a Type B Unit as to which Early Settlement is effected equal to
[_________] shares of Common Stock per Purchase Contract (the "Early Settlement
Rate"). The Early Settlement Rate shall be adjusted in the same manner and at
the same time as the Settlement Rate is adjusted as provided in the Purchase
Contract Agreement.

        Upon registration of transfer of this Type B Unit Certificate, the
transferee shall be bound (without the necessity of any other action on the part
of such transferee, except as may be required by the Agent pursuant to the
Purchase Contract Agreement), under the terms of the Purchase Contract Agreement
and the Purchase Contracts evidenced hereby and the transferor shall be released
from the obligations under the Purchase Contracts evidenced by this Type B Unit
Certificate. The Company covenants and agrees, and the Holder, by its acceptance
hereof, likewise covenants and agrees, to be bound by the provisions of this
paragraph.

        The Holder of this Type B Unit Certificate, by its acceptance hereof,
authorizes the Agent to enter into and perform the related Purchase Contracts
forming part of the Type B Units evidenced hereby on its behalf as its
attorney-in-fact, expressly withholds any consent to the assumption (i.e.,
affirmance) of the Purchase Contracts by the Company or its trustee in the event
that the Company becomes the subject of a case under the Bankruptcy Code, agrees
to be bound by the terms and provisions thereof, covenants and agrees to perform
its obligations under such Purchase Contracts, consents to the provisions of the
Purchase Contract Agreement, authorizes the Agent to enter into and perform the
Purchase Contract Agreement and the Pledge Agreement on its behalf as its
attorney-in-fact, and consents to the Pledge of the Treasury Securities
underlying this Type B Unit Certificate pursuant to the Pledge Agreement. The
Holder further covenants and agrees, that, to the extent and in the manner
provided in the Purchase Contract Agreement and the Pledge Agreement, but
subject to the terms thereof, payments in respect of the aggregate principal
amount of the Pledged Treasury Securities on the Purchase Contract Settlement
Date shall be paid by the Collateral Agent to the Company in satisfaction of
such Holder's obligations under such Purchase Contract and such Holder shall
acquire no right, title or interest in such payments.

                                       B-8

<PAGE>

        Subject to certain exceptions, the provisions of the Purchase Contract
Agreement may be amended with the consent of the Holders of a majority of the
Purchase Contracts.

        The Purchase Contracts shall for all purposes be governed by, and
construed in accordance with, the laws of the State of New York.

        The Company, the Agent and its Affiliates and any agent of the Company
or the Agent may treat the Person in whose name this Type B Unit Certificate is
registered as the owner of the Type B Units evidenced hereby for the purpose of
receiving payments of interest on the Treasury Securities, receiving payments of
Contract Adjustment Payments, performance of the Purchase Contracts and for all
other purposes whatsoever, whether or not any payments in respect thereof be
overdue and notwithstanding any notice to the contrary, and neither the Company,
the Agent nor any such agent shall be affected by notice to the contrary.

        The Purchase Contracts shall not, prior to the settlement thereof,
entitle the Holder to any of the rights of a holder of shares of Common Stock.

        A copy of the Purchase Contract Agreement is available for inspection at
the offices of the Agent.

                                       B-9

<PAGE>

                                  ABBREVIATIONS

        The following abbreviations, when used in the inscription on the face of
this instrument, shall be construed as though they were written out in full
according to applicable laws or regulations:

<TABLE>

<S>                                        <C>
TEN COM -                                  as tenants in common
UNIF GIFT MIN ACT -                        ---------------Custodian---------------
                                           (cust)                           (minor)

                                           Under Uniform Gifts to Minors Act of _____
                                           __________________________________________

TEN ENT -                                  as tenants by the entireties
JT TEN -                                   as joint tenants with right of survivorship and
                                           not as tenants in common
</TABLE>

Additional abbreviations may also be used though not in the above list.
                            -------------------------

                  FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s)
and transfer(s) unto __________________________________________________________

 (Please insert Social Security or Taxpayer I.D. or other Identifying Number of
                                   Assignee)
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________

                   (Please Print or Type Name and Address Including Postal
Zip Code of Assignee) the within Type B Unit Certificates and all rights
thereunder, hereby irrevocably constituting and appointing _______________
attorney to transfer said Type B Unit Certificates on the books of
[Name of Company] with full power of substitution in the premises.

<TABLE>

<S>                                          <C>
Dated: ___________________                   ______________________________________________
                                             Signature

                                             NOTICE: The signature to this assignment must
                                             correspond with the name as it appears upon the face of
                                             the within Type B Unit Certificates in every particular,
                                             without alteration or enlargement or any change
                                             whatsoever.

</TABLE>

Signature Guarantee: ___________________________________

                                      B-10

<PAGE>

                             SETTLEMENT INSTRUCTIONS

        The undersigned Holder directs that a certificate for shares of Common
Stock deliverable upon settlement on or after the Purchase Contract Settlement
Date of the Purchase Contracts underlying the number of Type B Units evidenced
by this Type B Unit Certificate be registered in the name of, and delivered,
together with a check in payment for any fractional share, to the undersigned at
the address indicated below unless a different name and address have been
indicated below. If shares are to be registered in the name of a Person other
than the undersigned, the undersigned will pay any transfer tax payable incident
thereto.

<TABLE>

<S>                                                      <C>
Dated: _______________________                            _____________________________________
                                                          Signature
                                                          Signature Guarantee: ___________________
                                                          (if assigned to another person)
If shares are to be registered in the name of
and delivered to a Person other than the                  REGISTERED HOLDER
Holder, please (i) print such Person's name
and address and (ii) provide a guarantee of
your signature:
                                                          Please print name and
                                                          address of Registered
                                                          Holder:

-------------------------------------                     -------------------------------------
                Name                                                     Name

-------------------------------------                     -------------------------------------
               Address                                                  Address

-------------------------------------                     -------------------------------------

-------------------------------------                     -------------------------------------

-------------------------------------                     -------------------------------------

Social Security or other
Taxpayer Identification                                   _____________________________________
Number, if any
</TABLE>

                                      B-11

<PAGE>

                            ELECTION TO SETTLE EARLY

        The undersigned Holder of this Type B Unit Certificate irrevocably
exercises the option to effect Early Settlement in accordance with the terms of
the Purchase Contract Agreement with respect to the Purchase Contracts
underlying the number of Type B Units evidenced by this Type B Unit Certificate
specified below. The option to effect Early Settlement may be exercised only
with respect to Purchase Contracts underlying Type B Units with an aggregate
Stated Amount equal to $1,000 or an integral multiple thereof. The undersigned
Holder directs that a certificate for shares of Common Stock deliverable upon
such Early Settlement be registered in the name of, and delivered, together with
a check in payment for any fractional share and any Type B Unit Certificate
representing any Type B Units evidenced hereby as to which Early Settlement of
the related Purchase Contracts is not effected, to the undersigned at the
address indicated below unless a different name and address have been indicated
below. Pledged Treasury Securities deliverable upon such Early Settlement will
be transferred in accordance with the transfer instructions set forth below. If
shares are to be registered in the name of a Person other than the undersigned,
the undersigned will pay any transfer tax payable incident thereto.

Dated: ______________________              _____________________________________
                                                          Signature

Signature Guarantee: _____________________________________

                                      B-12

<PAGE>

        Number of Securities evidenced hereby as to which Early Settlement of
the related Purchase Contracts is being elected:

<TABLE>

<S>                                                       <C>
If shares of Common Stock of Type B Unit                  REGISTERED HOLDER
Certificates are to be registered in the name of
and delivered to and Pledged Treasury
Securities are to be transferred to a Person
other than the Holder, please print such
Person's name and address:

                                                          Please print name and
                                                          address of Registered
                                                          Holder:
-------------------------------------                     -------------------------------------
             Name                                                     Name

-------------------------------------                     -------------------------------------
           Address                                                  Address

-------------------------------------                     -------------------------------------

-------------------------------------                     -------------------------------------

-------------------------------------                     -------------------------------------

Social Security or other
Taxpayer Identification
Number, if any                                            _____________________________________

</TABLE>

Transfer Instructions for Pledged Treasury Securities Transferable Upon Early
Settlement or a Termination Event:

                                      B-13

<PAGE>

                     [TO BE ATTACHED TO GLOBAL CERTIFICATES]

            SCHEDULE OF INCREASES OR DECREASES IN GLOBAL CERTIFICATE

               The following increases or decreases in this Global
                          Certificate have been made:

<TABLE>
<CAPTION>

=======================  =======================  ======================  =======================  ======================
                                                                              Number of UNITS
                          Amount of decrease in   Amount of increase in      evidenced by this
                             Number of UNITS         Number of UNITS        Global Certificate     Signature of authorized
                            evidenced by the         evidenced by the         following such       officer of Trustee or
         Date              Global Certificate       Global Certificate     decrease or increase     Securities Custodian
<S>                      <C>                      <C>                      <C>                      <C>

=======================  =======================  ======================  =======================  ======================
</TABLE>

                                      B-14

<PAGE>

                                                                       EXHIBIT C

                     INSTRUCTION TO PURCHASE CONTRACT AGENT

[------------------------------]
Attention:

        Re:       ________ UNITS of Polaroid Corporation (the "Company")

        The undersigned Holder hereby notifies you that it has delivered to
[_________________], as Securities Intermediary, for credit to the Collateral
Account, $______ aggregate principal amount of [Debentures] [Treasury
Securities] in exchange for the [Pledged Debentures] [Pledged Treasury
Securities] held in the Collateral Account, in accordance with the Pledge
Agreement, dated as of [_________], 1999 (the "Pledge Agreement"; unless
otherwise defined herein, terms defined in the Pledge Agreement are used herein
as defined therein), between you, the Company, the Collateral Agent and the
Securities Intermediary. The undersigned Holder has paid all applicable fees
relating to such exchange. The undersigned Holder hereby instructs you to
instruct the Collateral Agent to release to you on behalf of the undersigned
Holder the [Pledged Debentures] [Pledged Treasury Securities] related to such
[Type A Units] [Type B Units].

Date: _______________________               ____________________________________
                                                          Signature

                                        Signature Guarantee:____________________

Please print name and address of Registered Holder:

------------------------------------        ------------------------------------
Name                                        Social Security or other Taxpayer
                                            Identification Number, if any
Address

------------------------------------

------------------------------------

------------------------------------

                                       C-1

<PAGE>

                                                                       EXHIBIT D
                       NOTICE FROM PURCHASE CONTRACT AGENT
                                   TO HOLDERS
         (Transfer of Collateral upon Occurrence of a Termination Event)

[HOLDER]
=======================
Attention:
Telecopy: __________

                Re:      __________ UNITS of POLAROID CORPORATION
                         (the "Company")

        Please refer to the Purchase Contract Agreement, dated as of
[_________], 1999 (the "Purchase Contract Agreement"; unless otherwise defined
herein, terms defined in the Purchase Contract Agreement are used herein as
defined therein), among the Company and the undersigned, as Purchase Contract
Agent and as attorney-in-fact for the holders of UNITS from time to time.

        We hereby notify you that a Termination Event has occurred and that [the
Debentures][the Treasury Securities] underlying your ownership interest in _____
[Type A Units][Type B Units] have been released and are being held by us for
your account pending receipt of transfer instructions with respect to such
[Debentures][Treasury Securities] (the "Released Securities").

        Pursuant to Section 3.15 of the Purchase Contract Agreement, we hereby
request written transfer instructions with respect to the Released Securities.
Upon receipt of your instructions and upon transfer to us of your [Type A
Units][Type B Units] effected through book-entry or by delivery to us of your
[Type A Unit Certificate][Type B Unit Certificate], we shall transfer the
Released Securities by book-entry transfer, or other appropriate procedures, in
accordance with your instructions. In the event you fail to effect such transfer
or delivery, the Released Securities and any interest thereon, shall be held in
our name, or a nominee in trust for your benefit, until such time as such [Type
A Units][Type B Units] are transferred or your [Type A Unit Certificate][Type B
Unit Certificate] is surrendered or satisfactory evidence is provided that your
[Type A Unit Certificate][Type B Unit Certificate] has been destroyed, lost or
stolen, together with any indemnification that we or the Company may require.

Date:                               By:     [________________________________]

                                             --------------------------------
                                             Name:
                                             Title:

                                       D-1

<PAGE>

                                                                       EXHIBIT E

                        NOTICE TO SETTLE BY SEPARATE CASH

[--------------------------]
Attention:

              Re:      ________ UNITS of Polaroid Corporation (the "Company")

        The undersigned Holder hereby irrevocably notifies you in accordance
with Section 5.4 of the Purchase Contract Agreement, dated as of [_________],
1999 (the "Purchase Contract Agreement"; unless otherwise defined herein, terms
defined in the Purchase Contract Agreement are used herein as defined therein),
between the Company and yourselves, as Purchase Contract Agent and as
Attorney-in-Fact for the Holders of the Purchase Contracts, that such Holder has
elected to pay to the Securities Intermediary for deposit in the Collateral
Account, on or prior to 11:00 a.m. New York City time, on the [fifth Business
Day][Business Day] immediately preceding the Purchase Contract Settlement Date
(in lawful money of the United States by certified or cashiers' check or wire
transfer, in immediately available funds), $______ as the Purchase Price for the
shares of Common Stock issuable to such Holder by the Company under the related
Purchase Contract on the Purchase Contract Settlement Date. The undersigned
Holder hereby instructs you to notify promptly the Collateral Agent of the
undersigned Holder's election to make such cash settlement with respect to the
Purchase Contracts related to such Holder's [Type A Units] [Type B Units].

Date: _______________________               ____________________________________
                                                         Signature

                                        Signature Guarantee:____________________

Please print name and address of Registered Holder:

                                       E-1

<PAGE>

                                                                       EXHIBIT F

                       NOTICE FROM PURCHASE CONTRACT AGENT
                    TO COLLATERAL AGENT AND INDENTURE TRUSTEE
                 (Payment of Purchase Contract Settlement Price)

[----------------------------
Attention:
Telecopy:

[----------------------------
Attention:
Telecopy:

              Re:      __________ UNITS of Polaroid Corporation (the "Company")

        Please refer to the Purchase Contract Agreement dated as of
[__________], 1999 (the "Purchase Contract Agreement"; unless otherwise defined
herein, terms defined in the Purchase Contract Agreement are used herein as
defined therein), between the Company and the undersigned, as Purchase Contract
Agent and as attorney-in-fact for the holders of UNITS from time to time.

        In accordance with Section 5.4 of the Purchase Contract Agreement and,
based on instructions and Cash Settlements received from Holders of Type A Units
as of 11:00 a.m, [DATE (FIFTH BUSINESS DAY IMMEDIATELY PRECEDING THE PURCHASE
CONTRACT SETTLEMENT DATE)], we hereby notify you that [_____ Debentures] are to
be tendered for purchase in the Remarketing.

Date:                            By:     [_____________________________________]

                                         --------------------------------
                                         Name:
                                         Title:

                                       F-1

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