<PAGE>   1
                                                                     Exhibit 4.1


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                                     UBS AG

                                       TO

                      U.S. BANK TRUST NATIONAL ASSOCIATION
                                     Trustee




                                    ---------


                                    INDENTURE



                          Dated as of November 21, 2000


                                    ---------



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<PAGE>   2
                               TABLE OF CONTENTS
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<TABLE>
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PARTIES.........................................................................................    1

RECITALS OF THE COMPANY.........................................................................    1


                                   ARTICLE ONE

                        DEFINITIONS AND OTHER PROVISIONS
                             OF GENERAL APPLICATION

SECTION 101.  Definitions.......................................................................    1
              Act...............................................................................    2
              Additional Amounts................................................................    2
              Affiliate; control................................................................    2
              Applicable Procedures.............................................................    2
              Authenticating Agent..............................................................    2
              Authorized Agent..................................................................    2
              Authorized Officer................................................................    2
              Board of Directors................................................................    2
              Board Resolution..................................................................    2
              Business Day......................................................................    2
              Commission........................................................................    2
              Company...........................................................................    2
              Company Request; Company Order....................................................    2
              convert...........................................................................    3
              converted.........................................................................    3
              conversion........................................................................    3
              Corporate Trust Office............................................................    3
              corporation.......................................................................    3
              Covenant Defeasance...............................................................    3
              Defaulted Interest................................................................    3
              Defeasance........................................................................    3
              Depositary........................................................................    3
              Event of Default..................................................................    3
              Exchange Act......................................................................    3
              Expiration Date...................................................................    3
              Global Security...................................................................    3
              Group Executive Board.............................................................    3
              Holder............................................................................    3
              Indenture.........................................................................    3
              interest..........................................................................    4
</TABLE>

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Note: This Table of contents shall not, for any purpose, be deemed to be a part
of the Indenture.


                                       i
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<TABLE>
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              Interest Payment Date.............................................................    4
              Investment Company Act............................................................    4
              Maturity..........................................................................    4
              Notice of Default.................................................................    4
              Officers' Certificate.............................................................    4
              Opinion of Counsel................................................................    4
              Original Issue Discount Security..................................................    4
              Outstanding.......................................................................    4
              Paying Agent......................................................................    5
              Person............................................................................    5
              Place of Payment..................................................................    5
              Predecessor Security..............................................................    5
              Redemption Date...................................................................    5
              Redemption Price..................................................................    6
              Regular Record Date...............................................................    6
              Securities........................................................................    6
              Securities Act....................................................................    6
              Security Register; Security Registrar.............................................    6
              Special Record Date...............................................................    6
              Stated Maturity...................................................................    6
              Subsidiary........................................................................    6
              Trust Indenture Act...............................................................    6
              Trustee...........................................................................    6
              U.S. Government Obligation........................................................    6
              Vice President....................................................................    6
SECTION 102.  Compliance Certificates and Opinions..............................................    7
SECTION 103.  Form of Documents Delivered to Trustee............................................    7
SECTION 104.  Acts of Holders; Record Dates.....................................................    8
SECTION 105.  Notices, Etc., to Trustee and Company.............................................    9
SECTION 106.  Notice to Holders; Waiver.........................................................   10
SECTION 107.  Conflict with Trust Indenture Act.................................................   10
SECTION 108.  Effect of Headings and Table of Contents..........................................   10
SECTION 109.  Successors and Assigns............................................................   11
SECTION 110.  Separability Clause...............................................................   11
SECTION 111.  Benefits of Indenture.............................................................   11
SECTION 112.  Governing Law.....................................................................   11
SECTION 113.  Submission to Jurisdiction; Appointment of Agent for Service of Process...........   11
SECTION 114.  Legal Holidays....................................................................   12

                                   ARTICLE TWO

                                 SECURITY FORMS

SECTION 201.  Forms Generally...................................................................   12
SECTION 202.  Form of Face of Security..........................................................   12
SECTION 203.  Form of Reverse of Security.......................................................   14
SECTION 204.  Form of Legend for Global Securities..............................................   18
</TABLE>


                                       ii
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<TABLE>
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SECTION 205.  Form of Trustee's Certificate of Authentication...................................   19

                                  ARTICLE THREE

                                 THE SECURITIES

SECTION 301.  Amount Unlimited; Issuable in Series..............................................   19
SECTION 302.  Denominations.....................................................................   21
SECTION 303.  Execution, Authentication, Delivery and Dating....................................   22
SECTION 304.  Temporary Securities..............................................................   23
SECTION 305.  Registration, Registration of Transfer and Exchange...............................   23
SECTION 306.  Mutilated, Destroyed, Lost and Stolen Securities..................................   25
SECTION 307.  Payment of Interest; Interest Rights Preserved....................................   26
SECTION 308.  Persons Deemed Owners.............................................................   27
SECTION 309.  Cancellation......................................................................   27
SECTION 310.  Computation of Interest...........................................................   28
SECTION 311.  CUSIP Numbers.....................................................................   28

                                  ARTICLE FOUR

                           SATISFACTION AND DISCHARGE

SECTION 401.  Satisfaction and Discharge of Indenture...........................................   28
SECTION 402.  Application of Trust Money........................................................   29

                                  ARTICLE FIVE

                                    REMEDIES

SECTION 501.  Events of Default.................................................................   29
SECTION 502.  Acceleration of Maturity; Rescission and Annulment................................   30
SECTION 503.  Collection of Indebtedness and Suits for Enforcement by Trustee...................   31
SECTION 504.  Trustee May File Proofs of Claim..................................................   32
SECTION 505.  Trustee May Enforce Claims Without Possession of Securities.......................   32
SECTION 506.  Application of Money Collected....................................................   32
SECTION 507.  Limitation on Suits...............................................................   33
SECTION 508.  Unconditional Right of Holders to Receive Principal, Premium and Interest and to
              Convert...........................................................................   33
SECTION 509.  Restoration of Rights and Remedies................................................   34
SECTION 510.  Rights and Remedies Cumulative....................................................   34
SECTION 511.  Delay or Omission Not Waiver......................................................   34
SECTION 512.  Control by Holders................................................................   34
SECTION 513.  Waiver of Past Defaults...........................................................   35
SECTION 514.  Undertaking for Costs.............................................................   35
SECTION 515.  Waiver of Usury, Stay or Extension Laws...........................................   35
</TABLE>


                                      iii
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<TABLE>
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                                   ARTICLE SIX

                                   THE TRUSTEE

SECTION 601.  Certain Duties and Responsibilities...............................................   35
SECTION 602.  Notice of Defaults................................................................   36
SECTION 603.  Certain Rights of Trustee.........................................................   36
SECTION 604.  Not Responsible for Recitals or Issuance of Securities............................   37
SECTION 605.  May Hold Securities...............................................................   37
SECTION 606.  Money Held in Trust...............................................................   37
SECTION 607.  Compensation and Reimbursement....................................................   38
SECTION 608.  Conflicting Interests.............................................................   38
SECTION 609.  Corporate Trustee Required; Eligibility...........................................   38
SECTION 610.  Resignation and Removal; Appointment of Successor.................................   39
SECTION 611.  Acceptance of Appointment by Successor............................................   40
SECTION 612.  Merger, Conversion, Consolidation or Succession to Business.......................   41
SECTION 613.  Preferential Collection of Claims Against Company.................................   41
SECTION 614.  Appointment of Authenticating Agent...............................................   41

                                  ARTICLE SEVEN

                HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

SECTION 701.  Company to Furnish Trustee Names and Addresses of Holders.........................   43
SECTION 702.  Preservation of Information; Communications to Holders............................   43
SECTION 703.  Reports by Trustee................................................................   43
SECTION 704.  Reports by Company................................................................   44

                                  ARTICLE EIGHT

              CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

SECTION 801.  [Company May Consolidate, Etc., Only on Certain Terms.............................   44
SECTION 802.  Successor Substituted.............................................................   45

                                  ARTICLE NINE

                             SUPPLEMENTAL INDENTURES

SECTION 901.  Supplemental Indentures Without Consent of Holders................................   45
SECTION 902.  Supplemental Indentures With Consent of Holders...................................   46
SECTION 903.  Execution of Supplemental Indentures..............................................   47
SECTION 904.  Effect of Supplemental Indentures.................................................   47
SECTION 905.  Conformity with Trust Indenture Act...............................................   48
SECTION 906.  Reference in Securities to Supplemental Indentures................................   48

                                   ARTICLE TEN

                                    COVENANTS

SECTION 1001. Payment of Principal, Premium and Interest........................................   48
</TABLE>


                                       iv
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<TABLE>
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SECTION 1002. Maintenance of Office or Agency...................................................   48
SECTION 1003. Money for Securities Payments to Be Held in Trust.................................   49
SECTION 1004. Statement by Officers as to Default...............................................   49
SECTION 1005. Existence.........................................................................   50
SECTION 1006. Payment of Taxes and Other Claims.................................................   50
SECTION 1007. Payment of Additional Amounts.....................................................   50
SECTION 1008. Waiver of Certain Covenants.......................................................   51

                                 ARTICLE ELEVEN

                            REDEMPTION OF SECURITIES

SECTION 1101. Applicability of Article..........................................................   52
SECTION 1102. Election to Redeem; Notice to Trustee.............................................   52
SECTION 1103. Selection by Trustee of Securities to Be Redeemed.................................   52
SECTION 1104. Notice of Redemption..............................................................   53
SECTION 1105. Deposit of Redemption Price.......................................................   54
SECTION 1106. Securities Payable on Redemption Date.............................................   54
SECTION 1107. Securities Redeemed in Part.......................................................   54
SECTION 1108. Optional Redemption for Tax Reasons...............................................   55

                                 ARTICLE TWELVE

                                  SINKING FUNDS

SECTION 1201. Applicability of Article..........................................................   55
SECTION 1202. Satisfaction of Sinking Fund Payments with Securities.............................   56
SECTION 1203. Redemption of Securities for Sinking Fund.........................................   56

                                ARTICLE THIRTEEN

                       DEFEASANCE AND COVENANT DEFEASANCE

SECTION 1301. Company's Option to Effect Defeasance or Covenant Defeasance......................   56
SECTION 1302. Defeasance and Discharge..........................................................   56
SECTION 1303. Covenant Defeasance...............................................................   57
SECTION 1304. Conditions to Defeasance or Covenant Defeasance...................................   57
SECTION 1305. Deposited Money and U.S. Government Obligations to Be Held in Trust;
              Miscellaneous Provisions..........................................................   59
SECTION 1306. Reinstatement.....................................................................   59

</TABLE>


                                       v
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                 ..............................................

    CERTAIN SECTIONS OF THIS INDENTURE RELATING TO SECTIONS 310 THROUGH 318,
                 INCLUSIVE, OF THE TRUST INDENTURE ACT OF 1939:

<TABLE>
<CAPTION>
   TRUST INDENTURE
     ACT SECTION                                                               INDENTURE SECTION
<S>                   <C>                                                      <C>
Section 310(a)(1)     .......................................................  609
           (a)(2)     .......................................................  609
           (a)(3)     .......................................................  Not Applicable
           (a)(4)     .......................................................  Not Applicable
           (b)        .......................................................  608
                                                                               610
Section 311(a)        .......................................................  613
           (b)        .......................................................  613
Section 312(a)        .......................................................  701
                                                                               702
           (b)        .......................................................  702
           (c)        .......................................................  702
Section 313(a)        .......................................................  703
           (b)        .......................................................  703
           (c)        .......................................................  703
           (d)        .......................................................  703
Section 314(a)        .......................................................  704
           (a)(4)     .......................................................  101
                                                                               1004
           (b)        .......................................................  Not Applicable
           (c)(1)     .......................................................  102
           (c)(2)     .......................................................  102
           (c)(3)     .......................................................  Not Applicable
           (d)        .......................................................  Not Applicable
           (e)        .......................................................  102
Section 315(a)        .......................................................  601
           (b)        .......................................................  602
           (c)        .......................................................  601
           (d)        .......................................................  601
           (e)        .......................................................  514
Section 316(a)        .......................................................  101
           (a)(1)(A)  .......................................................  502
                                                                               512
           (a)(1)(B)  .......................................................  513
           (a)(2)     .......................................................  Not Applicable
           (b)        .......................................................  508
           (c)        .......................................................  104
Section 317(a)(1)     .......................................................  503
           (a)(2)     .......................................................  504
           (b)        .......................................................  1003
Section 318(a)        .......................................................  107
</TABLE>

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NOTE: This reconciliation and tie shall not, for any purpose, be deemed to be a
part of the Indenture.


                                       vi
<PAGE>   8
            INDENTURE, dated as of ___________, 2000, between UBS AG, a
corporation duly organized and existing under the laws of Switzerland (herein
called the "Company"), having its principal office at Bahnhofstrasse 45, Zurich,
Switzerland, and U.S. Bank Trust National Association, a national banking
association duly organized and existing under the laws of the United States, as
Trustee (herein called the "Trustee").


                             RECITALS OF THE COMPANY

            The Company has duly authorized the execution and delivery of this
Indenture to provide for the issuance from time to time of its unsecured
debentures, notes or other evidences of indebtedness (herein called the
"Securities"), to be issued in one or more series as in this Indenture provided.

            All things necessary to make this Indenture a valid agreement of the
Company, in accordance with its terms, have been done.

            NOW, THEREFORE, THIS INDENTURE WITNESSETH:

            For and in consideration of the premises and the purchase of the
Securities by the Holders thereof, it is mutually agreed, for the equal and
proportionate benefit of all Holders of the Securities or of series thereof, as
follows:

                                   ARTICLE ONE

                        DEFINITIONS AND OTHER PROVISIONS
                             OF GENERAL APPLICATION

SECTION 101. Definitions.

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

            (1)   the terms defined in this Article have the meanings assigned
      to them in this Article and include the plural as well as the singular;

            (2)   all other terms used herein which are defined in the Trust
      Indenture Act, either directly or by reference therein, have the meanings
      assigned to them therein;

            (3)   all accounting terms not otherwise defined herein have the
      meanings assigned to them in accordance with generally accepted accounting
      principles, and, except as otherwise herein expressly provided, the term
      "generally accepted accounting principles" with respect to any computation
      required or permitted hereunder shall mean such accounting principles as
      are generally accepted -- at the date of such computation;

            (4)   unless the context otherwise requires, any reference to an
      "Article" or a "Section" refers to an Article or a Section, as the case
      may be, of this Indenture; and
<PAGE>   9
            (5)   the words "herein", "hereof" and "hereunder" and other words
      of similar import refer to this Indenture as a whole and not to any
      particular Article, Section or other subdivision.

            "Act", when used with respect to any Holder, has the meaning
specified in Section 104.

            "Additional Amounts" has the meaning specified in Section 1007.

            "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.

            "Applicable Procedures" of a Depositary means, with respect to any
matter at any time, the policies and procedures of such Depositary, if any, that
are applicable to such matter at such time.

            "Authenticating Agent" means any Person authorized by the Trustee
pursuant to Section 614 to act on behalf of the Trustee to authenticate
Securities of one or more series.

            "Authorized Agent" has the meaning specified in Section 113.

            "Authorized Officer" means an officer having the title of Chief
Financial Officer, Managing Director, Executive Director or Director of the
Company.

            "Board of Directors" means either the board of directors of the
Company or any duly authorized committee of that board or the Group Executive
Board.

            "Board Resolution" means a copy of a resolution certified by the
Secretary or an Assistant Secretary of the Company to 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 Trustee.

            "Business Day", when used with respect to any Place of Payment,
except as may otherwise be provided in the form of Securities of any particular
series, means each Monday, Tuesday, Wednesday, Thursday and Friday which is not
a day on which banking institutions in that Place of Payment are authorized or
obligated by law or executive order to close.

            "Commission" means the Securities and Exchange Commission, from time
to time constituted, created under the Exchange Act, or, if at any time after
the execution of this instrument such Commission is not existing and performing
the duties now assigned to it under the Trust Indenture Act, then the body
performing such duties at such time.

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

            "Company Request" or "Company Order" means a written request or
order signed in the name of the Company by any two Authorized Officers, and
delivered to the Trustee.


                                       2
<PAGE>   10
            "convert", "converted" and "conversion," when used with respect to
any Security, are intended to refer to the right of the Holder or the Company to
convert or exchange such Security into or for securities or other property in
accordance with such terms, if any, as may hereafter be specified for such
Security as contemplated by Section 301, and these words are not intended to
refer to any right of the Holder or the Company to exchange such Security for
other Securities of the same series and like tenor pursuant to Section 304, 305,
306, 906 or 1107 or another similar provision of this Indenture, unless the
context otherwise requires; and references herein to the terms of any Security
that may be converted mean such terms as may be specified for such Security as
contemplated in Section 301.

            "Corporate Trust Office" means the principal office of the Trustee
in New York, New York at which at any particular time its corporate trust
business shall be administered, which at the date of this Indenture is located
at 100 Wall Street, Suite 1600, New York, NY 10005, attn: Corporate Trust
Administration-UBS.

            "corporation" means a corporation, association, company, joint-stock
company or business trust.

            "Covenant Defeasance" has the meaning specified in Section 1303.

            "Defaulted Interest" has the meaning specified in Section 307.

            "Defeasance" has the meaning specified in Section 1302.

            "Depositary" means, with respect to Securities of any series
issuable in whole or in part in the form of one or more Global Securities, a
clearing agency registered under the Exchange Act that is designated to act as
Depositary for such Securities as contemplated by Section 301.

            "Event of Default" has the meaning specified in Section 501.

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

            "Expiration Date" has the meaning specified in Section 104.

            "Global Security" means a Security that evidences all or part of the
Securities of any series and bears the legend set forth in Section 204 (or such
legend as may be specified as contemplated by Section 301 for such Securities).

            "Group Executive Board" means the most senior executive body of the
Company, including the Chief Executive Officer and the Chief Financial Officer.

            "Holder" means a Person in whose name a Security is registered in
the Security Register.

            "Indenture" means this instrument as originally executed and as it
may from time to time be supplemented or amended by one or more indentures
supplemental hereto entered into pursuant to the applicable provisions hereof,
including, for all purposes of this instrument and any such supplemental
indenture, the provisions of the Trust Indenture Act that are deemed to be a
part of and govern this instrument and any such supplemental indenture,
respectively. The term


                                       3
<PAGE>   11
"Indenture" shall also include the terms of particular series of Securities
established as contemplated by Section 301.

            "interest", when used with respect to an Original Issue Discount
Security which by its terms bears interest only after Maturity, means interest
payable after Maturity.

            "Interest Payment Date", when used with respect to any Security,
means the Stated Maturity of an installment of interest on such Security.

            "Investment Company Act" means the Investment Company Act of 1940
and any statute successor thereto, in each case as amended from time to time.

            "Maturity", when used with respect to any Security, means the date
on which the principal of such Security or an installment of principal becomes
due and payable as therein or herein provided, whether at the Stated Maturity or
by declaration of acceleration, call for redemption or otherwise.

            "Notice of Default" means a written notice of the kind specified in
Section 501(4).

            "Officers' Certificate" means a certificate signed any two
authorized officers of the Company, and delivered to the Trustee. One of the
officers signing an Officers' Certificate given pursuant to Section 1004 shall
be the principal executive, financial or accounting officer of the Company.

            "Opinion of Counsel" means a written opinion of counsel, who may be
counsel for the Company, and who shall be acceptable to the Trustee.

            "Original Issue Discount Security" means any Security which provides
for an amount less than the principal amount thereof to be due and payable upon
a declaration of acceleration of the Maturity thereof pursuant to Section 502.

            "Outstanding", when used with respect to Securities, means, as of
the date of determination, all Securities theretofore authenticated and
delivered under this Indenture, except:

            (1)   Securities theretofore cancelled by the Trustee or delivered
      to the Trustee for cancellation;

            (2)   Securities for whose payment or redemption money in the
      necessary amount has been theretofore deposited with the Trustee or any
      Paying Agent (other than the Company) in trust or set aside and segregated
      in trust by the Company (if the Company shall act as its own Paying Agent)
      for the Holders of such Securities; provided that, if such Securities are
      to be redeemed, notice of such redemption has been duly given pursuant to
      this Indenture or provision therefor satisfactory to the Trustee has been
      made;

            (3)   Securities as to which Defeasance has been effected pursuant
      to Section 1302;

            (4)   Securities which have been paid pursuant to Section 306 or in
      exchange for or in lieu of which other Securities have been authenticated
      and delivered pursuant to this Indenture, other than any such Securities
      in respect of which there shall have been presented


                                       4
<PAGE>   12
      to the Trustee proof satisfactory to it that such Securities are held by a
      bona fide purchaser in whose hands such Securities are valid obligations
      of the Company; and

            (5)   Securities as to which any property deliverable upon
      conversion (other than when such conversion is at the option of the Holder
      and the Holder has not exercised such option) thereof has been delivered
      (or such delivery has been duly provided for), or as to which any other
      particular conditions have been satisfied, in each case as may be provided
      for such Securities as contemplated in Section 301;

provided, however, that in determining whether the Holders of the requisite
principal amount of the Outstanding Securities have given, made or taken any
request, demand, authorization, direction, notice, consent, waiver or other
action hereunder as of any date, (A) the principal amount of an Original Issue
Discount Security which shall be deemed to be Outstanding shall be the amount of
the principal thereof which would be due and payable as of such date upon
acceleration of the Maturity thereof to such date pursuant to Section 502, (B)
if, as of such date, the principal amount payable at the Stated Maturity of a
Security is not determinable, the principal amount of such Security which shall
be deemed to be Outstanding shall be the amount as specified or determined as
contemplated by Section 301, (C) the principal amount of a Security denominated
in one or more foreign currencies or currency units which shall be deemed to be
Outstanding shall be the U.S. dollar equivalent, determined as of such date in
the manner provided as contemplated by Section 301, of the principal amount of
such Security (or, in the case of a Security described in Clause (A) or (B)
above, of the amount determined as provided in such Clause), and (D) Securities
owned by the Company or any other obligor upon the Securities or any Affiliate
of the Company or of such other obligor shall be disregarded and deemed not to
be Outstanding, except that, in determining whether the Trustee shall be
protected in relying upon any such request, demand, authorization, direction,
notice, consent, waiver or other action, only Securities which the Trustee knows
to be so owned shall be so disregarded. Securities so owned which have been
pledged in good faith may be regarded as Outstanding if the pledgee establishes
to the satisfaction of the Trustee the pledgee's right so to act with respect to
such Securities and that the pledgee is not the Company or any other obligor
upon the Securities or any Affiliate of the Company or of such other obligor.

            "Paying Agent" means any Person authorized by the Company to pay the
principal of or any premium or interest on any Securities on behalf of the
Company.

            "Person" means any individual, corporation, partnership, joint
venture, trust, unincorporated organization or government or any agency or
political subdivision thereof.

            "Place of Payment", when used with respect to the Securities of any
series, means the place or places where the principal of and any premium and
interest on the Securities of that series are payable as specified as
contemplated by Section 301.

            "Predecessor Security" of any particular Security means every
previous Security evidencing all or a portion of the same debt as that evidenced
by such particular Security; and, for the purposes of this definition, any
Security authenticated and delivered under Section 306 in exchange for or in
lieu of a mutilated, destroyed, lost or stolen Security shall be deemed to
evidence the same debt as the mutilated, destroyed, lost or stolen Security.

            "Redemption Date", when used with respect to any Security to be
redeemed, means the date fixed for such redemption by or pursuant to this
Indenture.


                                       5
<PAGE>   13
            "Redemption Price", when used with respect to any Security to be
redeemed, means the price at which it is to be redeemed pursuant to this
Indenture.

            "Regular Record Date" for the interest payable on any Interest
Payment Date on the Securities of any series means the date specified for that
purpose as contemplated by Section 301.

            "Securities" has the meaning stated in the first recital of this
Indenture and more particularly means any Securities authenticated and delivered
under this Indenture.

            "Securities Act" means the Securities Act of 1933 and any statute
successor thereto, in each case as amended from time to time.

            "Security Register" and "Security Registrar" have the respective
meanings specified in Section 305.

            "Special Record Date" for the payment of any Defaulted Interest
means a date fixed by the Trustee pursuant to Section 307.

            "Stated Maturity", when used with respect to any Security or any
installment of principal thereof or interest thereon, means the date specified
in such Security as the fixed date on which the principal of such Security or
such installment of principal or interest is due and payable.

            "Subsidiary" means any Person a majority of the combined voting
power of the total outstanding ownership interests of which is, at the time of
determination, beneficially owned or held, directly or indirectly, by the
Company or by one or more other Subsidiaries, or by the Company and one or more
other Subsidiaries. For the purposes of this definition, "voting power" means
power to vote in an ordinary election of directors (or, in the case of a Person
that is not a corporation, ordinarily to appoint or approve the appointment of
Persons holding similar positions), whether at all times or only so long as no
senior class of ownership interests has such voting power by reason of any
contingency.

            "Trust Indenture Act" means the Trust Indenture Act of 1939 as in
force at the date as of which this instrument was executed; provided, however,
that in the event the Trust Indenture Act of 1939 is amended after such date,
"Trust Indenture Act" means, to the extent required by any such amendment, the
Trust Indenture Act of 1939 as so amended.

            "Trustee" means the Person named as the "Trustee" in the first
paragraph of this instrument until a successor Trustee shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Trustee" shall mean or include each Person who is then a Trustee hereunder, and
if at any time there is more than one such Person, "Trustee" as used with
respect to the Securities of any series shall mean the Trustee with respect to
Securities of that series.

            "U.S. Government Obligation" has the meaning specified in Section
1304.

            "Vice President", when used with respect to the Company or the
Trustee, means any vice president, whether or not designated by a number or a
word or words added before or after the title "vice president".


                                       6
<PAGE>   14
SECTION 102. Compliance Certificates and Opinions.

            Upon any application or request by the Company to the Trustee to
take any action under any provision of this Indenture, the Company shall furnish
to the Trustee such certificates and opinions as may be required under the Trust
Indenture Act. Each such certificate or opinion shall be given in the form of an
Officers' Certificate, if to be given by an officer of the Company, or an
Opinion of Counsel, if to be given by counsel, and shall comply with the
requirements of the Trust Indenture Act and any other requirements set forth in
this Indenture.

            Every certificate or opinion with respect to compliance with a
condition or covenant provided for in this Indenture (except for certificates
provided for in Section 1004) 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
      has made such examination or investigation as is necessary to enable him
      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 103. Form of Documents Delivered to Trustee.

            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 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 Indenture, they may, but need not, be consolidated and
form one instrument.


                                       7
<PAGE>   15
SECTION 104. Acts of Holders; Record Dates.

            Any request, demand, authorization, direction, notice, consent,
waiver or other action provided or permitted by this Indenture to be given, made
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 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 Trustee 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
Indenture and (subject to Section 601) conclusive in favor of the Trustee and
the Company, if made in the manner provided in this Section.

            The fact and date of the execution by any Person of any such
instrument or writing may be proved by the affidavit of a witness of such
execution or by a certificate of a notary public or other officer authorized by
law to take acknowledgments of deeds, certifying that the individual signing
such instrument or writing acknowledged to him the execution thereof. Where such
execution is by a signer acting in a capacity other than his individual
capacity, such certificate or affidavit shall also constitute sufficient proof
of his authority. The fact and date of the execution of any such instrument or
writing, or the authority of the Person executing the same, may also be proved
in any other manner which the Trustee deems sufficient.

            The ownership of Securities shall be proved by the Security
Register.

            Any request, demand, authorization, direction, notice, consent,
waiver or other Act of the Holder of any Security shall bind every future Holder
of the same Security and the Holder of every Security 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 Trustee or the
Company in reliance thereon, whether or not notation of such action is made upon
such Security.

            The Company may set any day as a record date for the purpose of
determining the Holders of Outstanding Securities of any series entitled to
give, make or take any request, demand, authorization, direction, notice,
consent, waiver or other action provided or permitted by this Indenture to be
given, made or taken by Holders of Securities of such series, provided that the
Company may not set a record date for, and the provisions of this paragraph
shall not apply with respect to, the giving or making of any notice,
declaration, request or direction referred to in the next paragraph. If any
record date is set pursuant to this paragraph, the Holders of Outstanding
Securities of the relevant series on such record date, and no other Holders,
shall be entitled to take the relevant action, 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 principal amount of Outstanding Securities of such
series 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 of no effect), and nothing in this paragraph shall be construed
to render ineffective any action taken by Holders of the requisite principal
amount of Outstanding Securities of the relevant series 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


                                       8
<PAGE>   16
Date to be given to the Trustee in writing and to each Holder of Securities of
the relevant series in the manner set forth in Section 106.

            The Trustee may set any day as a record date for the purpose of
determining the Holders of Outstanding Securities of any series entitled to join
in the giving or making of (i) any Notice of Default, (ii) any declaration of
acceleration referred to in Section 502, (iii) any request to institute
proceedings referred to in Section 507(2) or (iv) any direction referred to in
Section 512, in each case with respect to Securities of such series. If any
record date is set pursuant to this paragraph, the Holders of Outstanding
Securities of such series on such record date, and no other Holders, shall be
entitled to join in such notice, declaration, request or direction, 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 principal amount of Outstanding
Securities of such series on such record date. Nothing in this paragraph shall
be construed to prevent the Trustee 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 of no effect), and nothing in this
paragraph shall be construed to render ineffective any action taken by Holders
of the requisite principal amount of Outstanding Securities of the relevant
series on the date such action is taken. Promptly after any record date is set
pursuant to this paragraph, the Trustee, at the Company's expense, shall cause
notice of such record date, the proposed action by Holders and the applicable
Expiration Date to be given to the Company in writing and to each Holder of
Securities of the relevant series in the manner set forth in Section 106.

            With respect to any record date set pursuant to this Section, the
party hereto that sets such record dates may designate any day 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 other party hereto in
writing, and to each Holder of Securities of the relevant series in the manner
set forth in Section 106, 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 party hereto that set such record date 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.

            Without limiting the foregoing, a Holder entitled hereunder to take
any action hereunder with regard to any particular Security may do so with
regard to all or any part of the principal amount of such Security or by one or
more duly appointed agents each of which may do so pursuant to such appointment
with regard to all or any part of such principal amount.

SECTION 105. Notices, Etc., to Trustee and Company.

            Any request, demand, authorization, direction, notice, consent,
waiver or Act of Holders or other document provided or permitted by this
Indenture to be made upon, given or furnished to, or filed with,

            (1)   the Trustee by any Holder or by the Company shall be
      sufficient for every purpose hereunder if made, given, furnished or filed
      in writing to or with the Trustee and received at its Corporate Trust
      Office, or


                                       9
<PAGE>   17
            (2)   the Company by the Trustee or by any Holder shall be
      sufficient for every purpose hereunder (unless otherwise herein expressly
      provided) if in writing and mailed, first-class postage prepaid, to the
      Company addressed to it at UBS AG, Structured Derivative Products, 677
      Washington Blvd, Stamford, CT 06901, Attn: Mark Ritter, with a copy to
      Legal and External Affairs, 677 Washington Blvd., Stamford, CT, 06901,
      Attn: Equities Group, or at any other address previously furnished in
      writing to the Trustee by the Company.

SECTION 106. Notice to Holders; Waiver.

            Where this Indenture 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 his address as it appears in the Security Register,
not later than the latest date (if any), and not earlier than the earliest date
(if any), 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 Indenture
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 Trustee, 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 Trustee shall
constitute a sufficient notification for every purpose hereunder.

            Where this Indenture provides for Notice of any event to a Holder of
a Global Security, such notice shall be sufficiently given if given to the
Depositary for such Security (or its designee), pursuant to its Applicable
Procedures, not later than the latest date (if any), and not earlier than the
earliest date (if any), prescribed for the giving of such notice.

SECTION 107. Conflict with Trust Indenture Act.

            If any provision hereof limits, qualifies or conflicts with a
provision of the Trust Indenture Act which is required under such Act to be a
part of and govern this Indenture, the latter provision shall control. If any
provision of this Indenture modifies or excludes any provision of the Trust
Indenture Act which may be so modified or excluded, the latter provision shall
be deemed to apply to this Indenture as so modified or to be excluded, as the
case may be.

SECTION 108. 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.


                                       10
<PAGE>   18
SECTION 109. Successors and Assigns.

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

SECTION 110. Separability Clause.

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

SECTION 111. Benefits of Indenture.

            Nothing in this Indenture or in the Securities, express or implied,
shall give to any Person, other than the parties hereto and their successors
hereunder and the Holders, any benefit or any legal or equitable right, remedy
or claim under this Indenture.

SECTION 112. Governing Law.

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

SECTION 113. Submission to Jurisdiction; Appointment of Agent for Service of
Process.

            The Company hereby appoints Robert C. Dinerstein, acting through its
office at 299 Park Avenue, New York, New York 10171 (or such other address in
the Borough of Manhattan, The City of New York, as such agent shall furnish in
writing to the Trustee) as its authorized agent (the "Authorized Agent") upon
which process may be served in any legal action or proceeding against it with
respect to its obligations under this Indenture or the Securities of any series,
as the case may be, instituted in any federal or state court in the Borough of
Manhattan, The City of New York by the Holder of any Security, and agrees that
service of process upon the Authorized Agent, together with written notice of
said service mailed or delivered to the Company, addressed as provided in
Section 105, shall be deemed in every respect effective service of process upon
the Company in any such legal action or proceeding, and the Company hereby
irrevocably submits to the non-exclusive jurisdiction of any such court in
respect of any such legal action or proceeding and waives, to the extent it may
effectively do so, any objection it may have to the laying of the venue of any
such legal action or proceeding. Such appointment shall be irrevocable so long
as the Holders of Securities shall have any rights pursuant to the terms of the
Securities or of this Indenture until the appointment of a successor Authorized
Agent by the Company and such successor's acceptance of such appointment. The
Company reserves the right to appoint another person located, or with an office,
in the Borough of Manhattan, The City of New York, selected in its sole
discretion, as a successor Authorized Agent, and upon acceptance of such
appointment by such a successor the appointment of the prior Authorized Agent
shall terminate. If for any reason the Robert C. Dinerstein ceases to be able to
act as the Authorized Agent or to have an address in the Borough of Manhattan,
The City of New York, the Company will appoint a successor Authorized Agent in
accordance with the preceding sentence. The Company further agrees to take any
and all action, including the filing of any and all documents and instruments as


                                       11
<PAGE>   19
may be necessary to continue such designation and appointment of such agent or
successor in full force and effect for as long as required hereunder.

SECTION 114. Legal Holidays.

            In any case where any Interest Payment Date, Redemption Date or
Stated Maturity of any Security shall not be a Business Day at any Place of
Payment, then (notwithstanding any other provision of this Indenture or of the
Securities (other than a provision of any Security which specifically states
that such provision shall apply in lieu of this Section)) payment of interest or
principal (and premium, if any) need not be made at such Place of Payment on
such date, but may be made on the next succeeding Business Day at such Place of
Payment with the same force and effect as if made on the Interest Payment Date
or Redemption Date, or at the Stated Maturity.

                                  ARTICLE TWO

                                 SECURITY FORMS

SECTION 201. Forms Generally.

            The Securities of each series shall be in substantially the form set
forth in this Article, or in such other form as shall be established by or
pursuant to a Board Resolution or in one or more indentures supplemental hereto,
in each case with such appropriate insertions, omissions, substitutions and
other variations as are required or permitted by this Indenture, and may have
such letters, numbers or other marks of identification and such legends or
endorsements placed thereon as may be required to comply with the rules of any
securities exchange or Depositary therefor or as may, consistently herewith, be
determined by the officers executing such Securities, as evidenced by their
execution thereof. If the form of Securities of any series is established by
action taken pursuant to a Board Resolution, a copy of an appropriate record of
such action shall be certified by the Secretary or an Assistant Secretary of the
Company and delivered to the Trustee at or prior to the delivery of the Company
Order contemplated by Section 303 for the authentication and delivery of such
Securities.

            The definitive Securities shall be printed, lithographed or engraved
on steel engraved borders or may be produced in any other manner, all as
determined by the officers executing such Securities, as evidenced by their
execution of such Securities.

SECTION 202. Form of Face of Security.

         [Insert any legend required by the Internal Revenue Code and the
regulations thereunder.]


                                       12
<PAGE>   20


                                     UBS AG

                               [Title of Security]

No.                                                                  $

         UBS AG, a corporation duly organized and existing under the laws of
Switzerland (herein called the "Company", which term includes any successor
Person under the Indenture hereinafter referred to), for value received, hereby
promises to pay to ..............................................., or
registered assigns, the principal sum of ......................................
Dollars on ........................................................[if the
Security is to bear interest prior to Maturity, insert -- , and to pay interest
thereon from ............. or from the most recent Interest Payment Date to
which interest has been paid or duly provided for, semi-annually on ............
and ............ in each year, commencing ........., at the rate of ....% per
annum, until the principal hereof is paid or made available for payment [if
applicable, insert -- , provided that any principal and premium, and any such
installment of interest, which is overdue shall bear interest at the rate of
 ...% per annum (to the extent that the payment of such interest shall be legally
enforceable), from the dates such amounts are due until they are paid or made
available for payment, and such interest shall be payable on demand]. The
interest so payable, and punctually paid or duly provided for, on any Interest
Payment Date will, as provided in such Indenture, be paid to the Person in whose
name this Security (or one or more Predecessor Securities) is registered at the
close of business on the Regular Record Date for such interest, which shall be
the ....... or ....... (whether or not a Business Day), as the case may be, next
preceding such Interest Payment Date. Any such interest not so punctually paid
or duly provided for will forthwith cease to be payable to the Holder on such
Regular Record Date and may either be paid to the Person in whose name this
Security (or one or more Predecessor Securities) is registered at the close of
business on a Special Record Date for the payment of such Defaulted Interest to
be fixed by the Trustee, notice whereof shall be given to Holders of Securities
of this series not less than 10 days prior to such Special Record Date, or be
paid at any time in any other lawful manner not inconsistent with the
requirements of any securities exchange on which the Securities of this series
may be listed, and upon such notice as may be required by such exchange, all as
more fully provided in said Indenture].

[If the Security is not to bear interest prior to Maturity, insert -- The
principal of this Security shall not bear interest except in the case of a
default in payment of principal upon acceleration, upon redemption or at Stated
Maturity and in such case the overdue principal and any overdue premium shall
bear interest at the rate of ....% per annum (to the extent that the payment of
such interest shall be legally enforceable), from the dates such amounts are due
until they are paid or made available for payment. Interest on any overdue
principal or premium shall be payable on demand.

         Payment of the principal of (and premium, if any) and [if applicable,
insert -- any such] interest on this Security will be made at the office or
agency of the Company maintained for that purpose in New York, New York, in such
coin or currency of the United States of America as at the time of payment is
legal tender for payment of public and private debts; provided, however, that at
the option of the Company payment of interest may be made by check mailed to the
address of the Person entitled thereto as such address shall appear in the
Security Register and, provided, further, that if this Security is a Global
Security, payment may be made pursuant to the Applicable Procedures of the
Depositary as permitted in said Indenture.


                                       13
<PAGE>   21

         Reference is hereby made to the further provisions of this Security 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 Trustee referred to on the reverse hereof by manual signature, this Security
shall not be entitled to any benefit under the Indenture or be valid or
obligatory for any purpose.

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

Dated:

                                          UBS AG



                                          By _____________________________



                                          By _____________________________



Attest:

 .........................................


SECTION 203. Form of Reverse of Security.

         This Security is one of a duly authorized issue of securities of the
Company (herein called the "Securities"), issued and to be issued in one or more
series under an Indenture, dated as of November 21, 2000 (herein called the
"Indenture", which term shall have the meaning assigned to it in such
instrument), between the Company and U.S. Bank Trust National Association, as
Trustee (herein called the "Trustee", which term includes any successor trustee
under the Indenture), and reference is hereby made to the Indenture for a
statement of the respective rights, limitations of rights, duties and immunities
thereunder of the Company, the Trustee and the Holders of the Securities and of
the terms upon which the Securities are, and are to be, authenticated and
delivered. This Security is one of the series designated on the face hereof [if
applicable, insert -- , limited in aggregate principal amount to $...........].

         [If applicable, insert -- The Securities of this series are subject to
redemption upon not less than 30 days' notice by mail, [if applicable, insert --
(1) on ........... in any year commencing with the year ...... and ending with
the year ...... through operation of the sinking fund for this series at a
Redemption Price equal to 100% of the principal amount, and (2)] at any time [if
applicable, insert -- on or after .........., 20..], as a whole or in part, at
the election of the Company, at the following Redemption Prices (expressed as
percentages of the principal amount): If redeemed [if applicable, insert -- on
or before ..............., ...%, and if redeemed] during the 12-month period
beginning ............. of the years indicated,


                                       14
<PAGE>   22

<TABLE>
<CAPTION>
                               Redemption                                        Redemption
Year                             Price                     Year                    Price
----                           ----------                  ----                  ----------
<S>                            <C>                         <C>                   <C>

</TABLE>

and thereafter at a Redemption Price equal to .....% of the principal amount,
together in the case of any such redemption [if applicable, insert -- (whether
through operation of the sinking fund or otherwise)] with accrued interest to
the Redemption Date, but interest installments whose Stated Maturity is on or
prior to such Redemption Date will be payable to the Holders of such Securities,
or one or more Predecessor Securities, of record at the close of business on the
relevant Record Dates referred to on the face hereof, all as provided in the
Indenture.]

         [If applicable, insert -- The Securities of this series are subject to
redemption upon not less than 30 days' notice by mail, (1) on ............ in
any year commencing with the year .... and ending with the year .... through
operation of the sinking fund for this series at the Redemption Prices for
redemption through operation of the sinking fund (expressed as percentages of
the principal amount) set forth in the table below, and (2) at any time [if
applicable, insert -- on or after ............], as a whole or in part, at the
election of the Company, at the Redemption Prices for redemption otherwise than
through operation of the sinking fund (expressed as percentages of the principal
amount) set forth in the table below: If redeemed during the 12-month period
beginning ............ of the years indicated,


<TABLE>
<CAPTION>
                                 Redemption Price                    Redemption Price For
                                  For Redemption                     Redemption Otherwise
                                Through Operation                   Than Through Operation
                                      of the                          of the Sinking Fund
Year                               Sinking Fund
----                            -----------------                   ----------------------
<S>                             <C>                                 <C>

</TABLE>

and thereafter at a Redemption Price equal to .....% of the principal amount,
together in the case of any such redemption (whether through operation of the
sinking fund or otherwise) with accrued interest to the Redemption Date, but
interest installments whose Stated Maturity is on or prior to such Redemption
Date will be payable to the Holders of such Securities, or one or more
Predecessor Securities, of record at the close of business on the relevant
Record Dates referred to on the face hereof, all as provided in the Indenture.]


                                       15
<PAGE>   23

         [If applicable, insert -- Notwithstanding the foregoing, the Company
may not, prior to ............., redeem any Securities of this series as
contemplated by [if applicable, insert -- Clause (2) of] the preceding paragraph
as a part of, or in anticipation of, any refunding operation by the application,
directly or indirectly, of moneys borrowed having an interest cost to the
Company (calculated in accordance with generally accepted financial practice) of
less than .....% per annum.]

         [If applicable, insert -- The sinking fund for this series provides for
the redemption on ............ in each year beginning with the year ....... and
ending with the year ...... of [if applicable, insert -- not less than
$.......... ("mandatory sinking fund") and not more than] $......... aggregate
principal amount of Securities of this series. Securities of this series
acquired or redeemed by the Company otherwise than through [if applicable,
insert -- mandatory] sinking fund payments may be credited against subsequent
[if applicable, insert -- mandatory] sinking fund payments otherwise required to
be made [if applicable, insert -- , in the inverse order in which they become
due].]

         [If the Security is subject to redemption of any kind, insert -- In the
event of redemption of this Security in part only, a new Security or Securities
of this series and of like tenor for the unredeemed portion hereof will be
issued in the name of the Holder hereof upon the cancellation hereof.]

         [If applicable, insert -- The Indenture contains provisions for
defeasance at any time of [the entire indebtedness of this Security] [or]
[certain restrictive covenants and Events of Default with respect to this
Security] [, in each case] upon compliance with certain conditions set forth in
the Indenture.]

         [If the Security is not an Original Issue Discount Security, insert --
If an Event of Default with respect to Securities of this series shall occur and
be continuing, the principal of the Securities of this series may be declared
due and payable in the manner and with the effect provided in the Indenture.]

         [If the Security is an Original Issue Discount Security, insert -- If
an Event of Default with respect to Securities of this series shall occur and be
continuing, an amount of principal of the Securities of this series may be
declared due and payable in the manner and with the effect provided in the
Indenture. Such amount shall be equal to -- insert formula for determining the
amount. Upon payment (i) of the amount of principal so declared due and payable
and (ii) of interest on any overdue principal, premium and interest (in each
case to the extent that the payment of such interest shall be legally
enforceable), all of the Company's obligations in respect of the payment of the
principal of and premium and interest, if any, on the Securities of this series
shall terminate.]

         Payments under the Securities will be made without withholding or
deduction for or on account of any present or future tax, duty, assessment or
governmental charge imposed upon or as a result of such payments by Switzerland
or any jurisdiction in which a Branch of the Company through which the
Securities are issued is located (or any political subdivision or taxing
authority thereof or therein) (a "Relevant Jurisdiction") ("Taxes"), unless
required by law. To the extent any such Taxes are so levied or imposed, the
Company will, subject to the exceptions and limitations set forth in Section
1007 of the Indenture, pay such additional amounts ("Additional Amounts") to the
Holder of any Security who is not a resident of a Relevant Jurisdiction as may
be necessary in order that every net payment of the principal of and interest on
such Security and


                                       16
<PAGE>   24

any other amounts payable on such Security, after withholding for or on account
of such Taxes imposed upon or as a result of such payment, will not be less than
the amount provided for in such Security to be then due and payable.

         [If applicable insert - In addition to its ability to redeem this
Security pursuant to the foregoing,] [i]f at any time as a result of any change
in or amendment to the laws or regulations of a Relevant Jurisdiction affecting
taxation, or a change in any application or interpretation of such laws or
regulations (including the decision of any court or tribunal) either generally
or in relation to any particular Securities, which change, amendment,
application or interpretation becomes effective on or after ________, 20__ in
making any payment of, or in respect of, the principal amount of, or any premium
or interest on, the Securities, the Company would be required to pay any
Additional Amounts with respect thereto, then the Securities will be redeemable
upon not less than 10 nor more than 60 days' notice by mail, at any time
thereafter, in whole but not in part, at the election of the Company as provided
in the Indenture at [their principal amount ] [if the Security is an Original
Issue Discount Security, insert an amount equal to ____, insert formula for
determining the amount], together in the case of any such redemption with any
accrued but unpaid interest to, the Redemption Date.]

         The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Holders of the Securities of each series to be
affected under the Indenture at any time by the Company and the Trustee with the
consent of the Holders of a majority in principal amount of the Securities at
the time Outstanding of each series to be affected. The Indenture also contains
provisions permitting the Holders of specified percentages in principal amount
of the Securities of each series at the time Outstanding, on behalf of the
Holders of all Securities of such series, to waive compliance by the Company
with certain provisions of the Indenture and certain past defaults under the
Indenture and their consequences. Any such consent or waiver by the Holder of
this Security shall be conclusive and binding upon such Holder and upon all
future Holders of this Security and of any Security issued upon the registration
of transfer hereof or in exchange herefor or in lieu hereof, whether or not
notation of such consent or waiver is made upon this Security.

         As provided in and subject to the provisions of the Indenture, the
Holder of this Security shall not have the right to institute any proceeding
with respect to the Indenture or for the appointment of a receiver or trustee or
for any other remedy thereunder, unless such Holder shall have previously given
the Trustee written notice of a continuing Event of Default with respect to the
Securities of this series, the Holders of not less than 25% in principal amount
of the Securities of this series at the time Outstanding shall have made written
request to the Trustee to institute proceedings in respect of such Event of
Default as Trustee and offered the Trustee reasonable indemnity, and the Trustee
shall not have received from the Holders of a majority in principal amount of
Securities of this series at the time Outstanding a direction inconsistent with
such request, and shall have failed to institute any such proceeding, for 60
days after receipt of such notice, request and offer of indemnity. The foregoing
shall not apply to any suit instituted by the Holder of this Security for the
enforcement of any payment of principal hereof or any premium or interest hereon
on or after the respective due dates expressed herein.

         No reference herein to the Indenture and no provision of this Security
or of the Indenture shall alter or impair the obligation of the Company, which
is absolute and unconditional, to pay the principal of and any premium and
interest on this Security at the times, place and rate, and in the coin or
currency, herein prescribed.


                                       17
<PAGE>   25

         As provided in the Indenture and subject to certain limitations therein
set forth, the transfer of this Security is registrable in the Security
Register, upon surrender of this Security for registration of transfer at the
office or agency of the Company in any place where the principal of and any
premium and interest on this Security are payable, duly endorsed by, or
accompanied by a written instrument of transfer in form satisfactory to the
Company and the Security Registrar duly executed by, the Holder hereof or his
attorney duly authorized in writing, and thereupon one or more new Securities of
this series and of like tenor, of authorized denominations and for the same
aggregate principal amount, will be issued to the designated transferee or
transferees.

         The Securities of this series are issuable only in registered form
without coupons in denominations of $....... and any integral multiple thereof.
As provided in the Indenture and subject to certain limitations therein set
forth, Securities of this series are exchangeable for a like aggregate principal
amount of Securities of this series and of like tenor of a different authorized
denomination, as requested by the Holder surrendering the same.

         No service charge shall be made for any such registration of transfer
or exchange, but the Company may require payment of a sum sufficient to cover
any tax or other governmental charge payable in connection therewith.

         Prior to due presentment of this Security for registration of transfer,
the Company, the Trustee and any agent of the Company or the Trustee may treat
the Person in whose name this Security is registered as the owner hereof for all
purposes, whether or not this Security be overdue, and neither the Company, the
Trustee nor any such agent shall be affected by notice to the contrary.

         This Security is a Global Security and is subject to the provisions of
the Indenture relating to Global Securities, including the limitations in
Section 305 thereof on transfers and exchanges of Global Securities.

         This Security and the Indenture will be governed by, and construed in
accordance with, the laws of the State of New York.

         All terms used in this Security which are defined in the Indenture
shall have the meanings assigned to them in the Indenture.


SECTION 204. Form of Legend for Global Securities.

         Unless otherwise specified as contemplated by Section 301 for the
Securities evidenced thereby, every Global Security authenticated and delivered
hereunder shall bear a legend in substantially the following form:

THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A
NOMINEE THEREOF. THIS SECURITY MAY NOT BE EXCHANGED IN WHOLE OR IN PART FOR A
SECURITY REGISTERED, AND NO TRANSFER OF THIS SECURITY IN WHOLE OR IN PART MAY BE
REGISTERED, IN THE NAME OF ANY PERSON OTHER THAN SUCH DEPOSITARY OR A NOMINEE
THEREOF, EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE.


                                       18
<PAGE>   26

SECTION 205. Form of Trustee's Certificate of Authentication.

         The Trustee's certificates of authentication shall be in substantially
the following form:

         This is one of the Securities of the series designated therein referred
to in the within-mentioned Indenture.


                                        U.S. Bank Trust National Association,
                                               As Trustee

                                        By ..................................
                                                     Authorized Signatory


                                  ARTICLE THREE

                                 THE SECURITIES


SECTION 301. Amount Unlimited; Issuable in Series.

         The aggregate principal amount of Securities which may be authenticated
and delivered under this Indenture is unlimited.

         The Securities may be issued in one or more series. There shall be
established in or pursuant to corporate authorization, subject to Section 303,
set forth, or determined in the manner provided, in an Officers' Certificate, or
established in one or more indentures supplemental hereto, prior to the issuance
of Securities of any series,

         (1) the title of the Securities of the series (which shall distinguish
     the Securities of the series from Securities of any other series);

         (2) any limit upon the aggregate principal amount of the Securities of
     the series which may be authenticated and delivered under this Indenture
     (except for Securities authenticated and delivered upon registration of
     transfer of, or in exchange for, or in lieu of, other Securities of the
     series pursuant to Section 304, 305, 306, 906 or 1107 and except for any
     Securities which, pursuant to Section 303, are deemed never to have been
     authenticated and delivered hereunder);

         (3) the Person to whom any interest on a Security of the series shall
     be payable, if other than the Person in whose name that Security (or one or
     more Predecessor Securities) is registered at the close of business on the
     Regular Record Date for such interest;

         (4) the date or dates on which the principal of any Securities of the
     series is payable;

         (5) the rate or rates at which any Securities of the series shall bear
     interest, if any, the date or dates from which any such interest shall
     accrue, the Interest Payment Dates on which any such interest shall be
     payable and the Regular Record Date for any such interest payable on any
     Interest Payment Date;


                                       19
<PAGE>   27

         (6) the place or places where the principal of and any premium and
     interest on any Securities of the series shall be payable;

         (7) other than with respect to any redemption of any Securities of the
     series pursuant to Section 1108, the period or periods within which, the
     price or prices at which and the terms and conditions upon which any
     Securities of the series may be redeemed, in whole or in part, at the
     option of the Company and, if other than by a Board Resolution, the manner
     in which any election by the Company to redeem the Securities shall be
     evidenced;

         (8) the obligation, if any, of the Company to redeem or purchase any
     Securities of the series pursuant to any sinking fund or analogous
     provisions or at the option of the Holder thereof and the period or periods
     within which, the price or prices at which and the terms and conditions
     upon which any Securities of the series shall be redeemed or purchased, in
     whole or in part, pursuant to such obligation;

         (9) if other than denominations of $1,000 and any integral multiple
     thereof, the denominations in which any Securities of the series shall be
     issuable;

         (10) if the amount of principal of or any premium or interest on any
     Securities of the series may be determined with reference to an index,
     other security (whether equity or debt) or formula, the manner in which
     such amounts shall be determined;

         (11) if other than the currency of the United States of America, the
     currency, currencies, composite currency, composite currencies or currency
     units in which the principal of or any premium or interest on any
     Securities of the series shall be payable and the manner of determining the
     equivalent thereof in the currency of the United States of America for any
     purpose, including for purposes of the definition of "Outstanding" in
     Section 101;

         (12) if the principal of or any premium or interest on any Securities
     of the series is to be payable, at the election of the Company or the
     Holder thereof, in one or more currencies, composite currencies or currency
     units other than that or those in which such Securities are stated to be
     payable, the currency, currencies, composite currency, composite currencies
     or currency units in which the principal of or any premium or interest on
     such Securities as to which such election is made shall be payable, the
     periods within which and the terms and conditions upon which such
     election is to be made and the amount so payable (or the manner in
     which such amount shall be determined);

         (13) if other than the entire principal amount thereof, the portion of
     the principal amount of any Securities of the series which shall be payable
     upon declaration of acceleration of the Maturity thereof pursuant to
     Section 502;

         (14) if the principal amount payable at the Stated Maturity of any
     Securities of the series will not be determinable as of any one or more
     dates prior to the Stated Maturity, the amount which shall be deemed to be
     the principal amount of such Securities as of any such date for any purpose
     thereunder or hereunder, including the principal amount thereof which shall
     be due and payable upon any Maturity other than the Stated Maturity or
     which shall be deemed to be Outstanding as of any date prior to the Stated
     Maturity (or, in any such case, the manner in which such amount deemed to
     be the principal amount shall be determined);


                                       20
<PAGE>   28

         (15) if applicable, that the Securities of the series, in whole or any
     specified part, shall be defeasible pursuant to Section 1302 or Section
     1303 or both such Sections and, if other than by a Board Resolution, the
     manner in which any election by the Company to defease such Securities
     shall be evidenced;

         (16) if applicable, that any Securities of the series shall be issuable
     in whole or in part in the form of one or more Global Securities and, in
     such case, the respective Depositaries for such Global Securities, the form
     of any legend or legends which shall be borne by any such Global Security
     in addition to or in lieu of that set forth in Section 204 and any
     circumstances in addition to or in lieu of those set forth in Clause (2) of
     the last paragraph of Section 305 in which any such Global Security may be
     exchanged in whole or in part for Securities registered, and any transfer
     of such Global Security in whole or in part may be registered, in the name
     or names of Persons other than the Depositary for such Global Security or a
     nominee thereof;

         (17) any addition to or change in the Events of Default which applies
     to any Securities of the series and any change in the right of the Trustee
     or the requisite Holders of such Securities to declare the principal amount
     thereof due and payable pursuant to Section 502;

         (18) any addition to or change in the covenants set forth in Article
     Ten which applies to Securities of the series;

         (19) any provisions necessary to permit or facilitate the issuance,
     payment or conversion of any Securities of the series that may be converted
     into securities or other property other than Securities of the same series
     and of like tenor, whether in addition to, or in lieu of, any payment of
     principal or other amount and whether at the option of the Company or
     otherwise;

         (20) if applicable, that Additional Amounts, pursuant to Section 1007,
     will not be payable by the Company in respect of the Securities of the
     series; and;

         (21) any other terms of the series (which terms shall not be
     inconsistent with the provisions of this Indenture, except as permitted by
     Section 901(5)).

         All Securities of any one series shall be substantially identical
except as to denomination and except as may otherwise be provided in or pursuant
to the Board Resolution referred to above and (subject to Section 303) set
forth, or determined in the manner provided, in the Officers' Certificate
referred to above or in any such indenture supplemental hereto.

         If any of the terms of the series are established by action taken
pursuant to a Board Resolution, a copy of an appropriate record of such action
shall be certified by the Secretary or an Assistant Secretary of the Company and
delivered to the Trustee at or prior to the delivery of the Officers'
Certificate setting forth the terms of the series.


SECTION 302. Denominations.

         The Securities of each series shall be issuable only in registered form
without coupons and only in such denominations as shall be specified as
contemplated by Section 301. In the absence of any such specified denomination
with respect to the Securities of any series, the


                                       21
<PAGE>   29

Securities of such series shall be issuable in denominations of $1,000 and any
integral multiple thereof.


SECTION 303. Execution, Authentication, Delivery and Dating.

         The Securities shall be executed on behalf of the Company by any two
Authorized Officers. The signature of any of these officers on the Securities
may be manual or facsimile.

         Securities 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 Securities or did not
hold such offices at the date of such Securities.

         At any time and from time to time after the execution and delivery of
this Indenture, the Company may deliver Securities of any series executed by the
Company to the Trustee for authentication, together with a Company Order for the
authentication and delivery of such Securities, and the Trustee in accordance
with the Company Order shall authenticate and deliver such Securities. If the
form or terms of the Securities of the series have been established by or
pursuant to one or more Board Resolutions as permitted by Sections 201 and 301,
in authenticating such Securities, and accepting the additional responsibilities
under this Indenture in relation to such Securities, the Trustee shall be
entitled to receive, and (subject to Section 601) shall be fully protected in
relying upon, an Opinion of Counsel stating,

         (1) if the form of such Securities has been established by or pursuant
     to Board Resolution as permitted by Section 201, that such form has been
     established in conformity with the provisions of this Indenture;

         (2) if the terms of such Securities have been established by or
     pursuant to Board Resolution as permitted by Section 301, that such terms
     have been established in conformity with the provisions of this Indenture;
     and

         (3) that such Securities, when authenticated and delivered by the
     Trustee and issued by the Company in the manner and subject to any
     conditions specified in such Opinion of Counsel, will constitute valid and
     legally binding obligations of the Company enforceable in accordance with
     their terms, subject to bankruptcy, insolvency, fraudulent transfer,
     reorganization, moratorium and similar laws of general applicability
     relating to or affecting creditors' rights and to general equity
     principles.

If such form or terms have been so established, the Trustee shall not be
required to authenticate such Securities if the issue of such Securities
pursuant to this Indenture will affect the Trustee's own rights, duties or
immunities under the Securities and this Indenture or otherwise in a manner
which is not reasonably acceptable to the Trustee.

         Notwithstanding the provisions of Section 301 and of the preceding
paragraph, if all Securities of a series are not to be originally issued at one
time, it shall not be necessary to deliver the Officers' Certificate otherwise
required pursuant to Section 301 or the Company Order and Opinion of Counsel
otherwise required pursuant to such preceding paragraph at or prior to the
authentication of each Security of such series if such documents are delivered
at or prior to the authentication upon original issuance of the first Security
of such series to be issued.


                                       22
<PAGE>   30

         Each Security shall be dated the date of its authentication.

         No Security shall be entitled to any benefit under this Indenture or be
valid or obligatory for any purpose unless there appears on such Security a
certificate of authentication substantially in the form provided for herein
executed by the Trustee by manual signature, and such certificate upon any
Security shall be conclusive evidence, and the only evidence, that such Security
has been duly authenticated and delivered hereunder. Notwithstanding the
foregoing, if any Security shall have been authenticated and delivered hereunder
but never issued and sold by the Company, and the Company shall deliver such
Security to the Trustee for cancellation as provided in Section 309, for all
purposes of this Indenture such Security shall be deemed never to have been
authenticated and delivered hereunder and shall never be entitled to the
benefits of this Indenture.


SECTION 304. Temporary Securities.

         Pending the preparation of definitive Securities of any series, the
Company may execute, and upon Company Order the Trustee shall authenticate and
deliver, temporary Securities which are printed, lithographed, typewritten,
mimeographed or otherwise produced, in any authorized denomination,
substantially of the tenor of the definitive Securities in lieu of which they
are issued and with such appropriate insertions, omissions, substitutions and
other variations as the officers executing such Securities may determine, as
evidenced by their execution of such Securities.

         If temporary Securities of any series are issued, the Company will
cause definitive Securities of that series to be prepared without unreasonable
delay. After the preparation of definitive Securities of such series, the
temporary Securities of such series shall be exchangeable for definitive
Securities of such series upon surrender of the temporary Securities of such
series at the office or agency of the Company in a Place of Payment for that
series, without charge to the Holder. Upon surrender for cancellation of any one
or more temporary Securities of any series, the Company shall execute and the
Trustee shall authenticate and deliver in exchange therefor one or more
definitive Securities of the same series, of any authorized denominations and of
like tenor and aggregate principal amount. Until so exchanged, the temporary
Securities of any series shall in all respects be entitled to the same benefits
under this Indenture as definitive Securities of such series and tenor.


SECTION 305. Registration, Registration of Transfer and Exchange.

         The Company shall cause to be kept at the Corporate Trust Office of the
Trustee a register (the register maintained in such office and in any other
office or agency of the Company in a Place of Payment being herein sometimes
collectively referred to as the "Security Register") in which, subject to such
reasonable regulations as it may prescribe, the Company shall provide for the
registration of Securities and of transfers of Securities. The Trustee is hereby
appointed "Security Registrar" for the purpose of registering Securities and
transfers of Securities as herein provided.

         Upon surrender for registration of transfer of any Security of a series
at the office or agency of the Company in a Place of Payment for that series,
the Company shall execute, and the Trustee shall authenticate and deliver, in
the name of the designated transferee or transferees, one or more new Securities
of the same series, of any authorized denominations and of like tenor and
aggregate principal amount.


                                       23
<PAGE>   31

         At the option of the Holder, Securities of any series may be exchanged
for other Securities of the same series, of any authorized denominations and of
like tenor and aggregate principal amount, upon surrender of the Securities to
be exchanged at such office or agency. Whenever any Securities are so
surrendered for exchange, the Company shall execute, and the Trustee shall
authenticate and deliver, the Securities which the Holder making the exchange is
entitled to receive.

         All Securities issued upon any registration of transfer or exchange of
Securities shall be the valid obligations of the Company, evidencing the same
debt, and entitled to the same benefits under this Indenture, as the Securities
surrendered upon such registration of transfer or exchange.

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

         No service charge shall be made for any registration of transfer or
exchange of Securities, but the Company may require payment 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 Securities, other than
exchanges pursuant to Section 304, 906 or 1107 not involving any transfer.

         If the Securities of any series (or of any series and specified tenor)
are to be redeemed in part, the Company shall not be required (A) to issue,
register the transfer of or exchange any Securities of that series (or of that
series and specified tenor, as the case may be) during a period beginning at the
opening of business 15 days before the day of the mailing of a notice of
redemption of any such Securities selected for redemption under Section 1103 and
ending at the close of business on the day of such mailing, or (B) to register
the transfer of or exchange any Security so selected for redemption in whole or
in part, except the unredeemed portion of any Security being redeemed in part.

         The provisions of Clauses (1), (2), (3) (4) and (5) below shall apply
only to Global Securities:

         (1) Each Global Security authenticated under this Indenture shall be
     registered in the name of the Depositary designated for such Global
     Security or a nominee thereof and delivered to such Depositary or a nominee
     thereof or custodian therefor, and each such Global Security shall
     constitute a single Security for all purposes of this Indenture.

         (2) Notwithstanding any other provision in this Indenture, and subject
     to such applicable provisions, if any, as may be specified as contemplated
     by Section 301, no Global Security may be exchanged in whole or in part for
     Securities registered, and no transfer of a Global Security in whole or in
     part may be registered, in the name of any Person other than the Depositary
     for such Global Security or a nominee thereof unless (A) such Depositary
     (i) has notified the Company that it is unwilling or unable to continue as
     Depositary for such Global Security or (ii) has ceased to be a clearing
     agency registered under the Exchange Act, (B) there shall have occurred and
     be continuing an Event of Default with respect to such Global Security or
     (C) there shall exist such circumstances, if any, in addition to or in lieu
     of the foregoing as have been specified for this purpose as contemplated by
     Section 301.


                                       24
<PAGE>   32

         (3) Subject to Clause (2) above and to such applicable provisions, if
     any, as may be specified as contemplated by Section 301, any exchange of a
     Global Security for other Securities may be made in whole or in part, and
     all Securities issued in exchange for a Global Security or any portion
     thereof shall be registered in such names as the Depositary for such Global
     Security shall direct.

         (4) Every Security authenticated and delivered upon registration of
     transfer of, or in exchange for or in lieu of, a Global Security or any
     portion thereof, whether pursuant to this Section, Section 304, 306, 906 or
     1107 or otherwise, shall be authenticated and delivered in the form of, and
     shall be, a Global Security, unless such Security is registered in the name
     of a Person other than the Depositary for such Global Security or a nominee
     thereof.

         (5) Except for the exchange rights provided in Clause (2) above, owners
     of beneficial interest in a Global Security held on their behalf by a
     Depositary shall not be entitled to receive physical delivery of Securities
     in definitive form, shall not be considered the Holders thereof for any
     purpose under this Indenture and shall have no rights under this Indenture
     with respect to such Global Security, and such Depositary may be treated by
     the Company, the Trustee and any agent of any of them as the Holder and
     owner of such Global Security for all purposes whatsoever. Notwithstanding
     the foregoing, the Depositary for any Global Security may grant proxies and
     otherwise authorize any person, including the beneficial owners of interest
     in such Global Security, to take any action which a Holder is entitled to
     take under this Indenture with respect to such Global Security.


SECTION 306. Mutilated, Destroyed, Lost and Stolen Securities.

         If any mutilated Security is surrendered to the Trustee, the Company
shall execute and the Trustee shall authenticate and deliver in exchange
therefor a new Security of the same series and of like tenor and principal
amount and bearing a number not contemporaneously outstanding.

         If there shall be delivered to the Company and the Trustee (i) evidence
to their satisfaction of the destruction, loss or theft of any Security and (ii)
such security or indemnity as may be required by them to save each of them and
any agent of either of them harmless, then, in the absence of notice to the
Company or the Trustee that such Security has been acquired by a bona fide
purchaser, the Company shall execute and the Trustee shall authenticate and
deliver, in lieu of any such destroyed, lost or stolen Security, a new Security
of the same series and of like tenor and principal amount and bearing a number
not contemporaneously outstanding.

         In case any such mutilated, destroyed, lost or stolen Security has
become or is about to become due and payable, the Company in its discretion may,
instead of issuing a new Security, pay such Security.

         Upon the issuance of any new Security under this Section, the Company
may require the payment 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 Trustee) connected therewith.

         Every new Security of any series issued pursuant to this Section in
lieu of any destroyed, lost or stolen Security shall constitute an original
additional contractual obligation of the Company, whether or not the destroyed,
lost or stolen Security shall be at any time enforceable by


                                       25
<PAGE>   33

anyone, and shall be entitled to all the benefits of this Indenture equally and
proportionately with any and all other Securities of that series duly issued
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 Securities.


SECTION 307. Payment of Interest; Interest Rights Preserved.

         Except as otherwise provided as contemplated by Section 301 with
respect to any series of Securities, interest on any Security which is payable,
and is punctually paid or duly provided for, on any Interest Payment Date shall
be paid to the Person in whose name that Security (or one or more Predecessor
Securities) is registered at the close of business on the Regular Record Date
for such interest.

         Any interest on any Security of any series which is payable, but is not
punctually paid or duly provided for, on any Interest Payment Date (herein
called "Defaulted Interest") shall forthwith cease to be payable to the Holder
on the relevant Regular Record Date by virtue of having been such Holder, and
such Defaulted Interest may be paid by the Company, at its election in each
case, as provided in Clause (1) or (2) below:

         (1) The Company may elect to make payment of any Defaulted Interest to
     the Persons in whose names the Securities of such series (or their
     respective Predecessor Securities) are registered at the close of business
     on a Special Record Date for the payment of such Defaulted Interest, which
     shall be fixed in the following manner. The Company shall notify the
     Trustee in writing of the amount of Defaulted Interest proposed to be paid
     on each Security of such series and the date of the proposed payment, and
     at the same time the Company shall deposit with the Trustee an amount of
     money equal to the aggregate amount proposed to be paid in respect of such
     Defaulted Interest or shall make arrangements satisfactory to the Trustee
     for such deposit prior to the date of the proposed payment, such money when
     deposited to be held in trust for the benefit of the Persons entitled to
     such Defaulted Interest as in this Clause provided. Thereupon the Trustee
     shall fix a Special Record Date for the payment of such Defaulted Interest
     which shall be not more than 15 days and not less than 10 days prior to the
     date of the proposed payment and not less than 10 days after the receipt by
     the Trustee of the notice of the proposed payment. The Trustee shall
     promptly notify the Company of such Special Record Date and, in the name
     and at the expense of the Company, shall cause notice of the proposed
     payment of such Defaulted Interest and the Special Record Date therefor to
     be given to each Holder of Securities of such series in the manner set
     forth in Section 106, not less than 10 days prior to such Special Record
     Date. Notice of the proposed payment of such Defaulted Interest and the
     Special Record Date therefor having been so mailed, such Defaulted Interest
     shall be paid to the Persons in whose names the Securities of such series
     (or their respective Predecessor Securities) are registered at the close of
     business on such Special Record Date and shall no longer be payable
     pursuant to the following Clause (2).

         (2) The Company may make payment of any Defaulted Interest on the
     Securities of any series in any other lawful manner not inconsistent with
     the requirements of any securities exchange on which such Securities may be
     listed, and upon such notice as may be required by


                                       26
<PAGE>   34

     such exchange, if, after notice given by the Company to the Trustee of
     the proposed payment pursuant to this Clause, such manner of payment
     shall be deemed practicable by the Trustee.

         Subject to the foregoing provisions of this Section, each Security
delivered under this Indenture upon registration of transfer of or in exchange
for or in lieu of any other Security shall carry the rights to interest accrued
and unpaid, and to accrue, which were carried by such other Security.

         In the case of any Security which is converted after any Regular Record
Date and on or prior to the next succeeding Interest Payment Date (other than
any Security whose Maturity is prior to such Interest Payment Date), interest
whose Stated Maturity is on such Interest Payment Date shall be payable on such
Interest Payment Date notwithstanding such conversion, and such interest
(whether or not punctually paid or duly provided for) shall be paid to the
Person in whose name that Security (or one or more Predecessor Securities) is
registered at the close of business on such Regular Record Date. Except as
otherwise expressly provided in the immediately preceding sentence, in the case
of any Security which is converted, interest whose Stated Maturity is after the
date of conversion of such Security shall not be payable. Notwithstanding the
foregoing, the terms of any Security that may be converted may provide that the
provisions of this paragraph do not apply, or apply with such additions, changes
or omissions as may be provided thereby, to such Security.


SECTION 308. Persons Deemed Owners.

         Prior to due presentment of a Security for registration of transfer,
the Company, the Trustee and any agent of the Company or the Trustee may treat
the Person in whose name such Security is registered as the owner of such
Security for the purpose of receiving payment of principal of and any premium
and (subject to Section 307) any interest on such Security and for all other
purposes whatsoever, whether or not such Security be overdue, and neither the
Company, the Trustee nor any agent of the Company or the Trustee shall be
affected by notice to the contrary.


SECTION 309. Cancellation.

         All Securities surrendered for payment, redemption, registration of
transfer or exchange or for credit against any sinking fund payment shall, if
surrendered to any Person other than the Trustee, be delivered to the Trustee
and shall be promptly cancelled by it. The Company may at any time deliver to
the Trustee for cancellation any Securities previously authenticated and
delivered hereunder which the Company may have acquired in any manner
whatsoever, and may deliver to the Trustee (or to any other Person for delivery
to the Trustee) for cancellation any Securities previously authenticated
hereunder which the Company has not issued and sold, and all Securities so
delivered shall be promptly cancelled by the Trustee. No Securities shall be
authenticated in lieu of or in exchange for any Securities cancelled as provided
in this Section, except as expressly permitted by this Indenture. All cancelled
Securities held by the Trustee shall be disposed of as directed by a Company
Order.


                                       27

<PAGE>   35
SECTION 310. Computation of Interest.

         Except as otherwise specified as contemplated by Section 301 for
Securities of any series, interest on the Securities of each series shall be
computed on the basis of a 360-day year of twelve 30-day months.

SECTION 311. CUSIP Numbers

         The Company in issuing the Securities may use CUSIP numbers (if then
generally in use) and, if so, the Trustee shall use CUSIP numbers in notices of
redemption as a convenience to Holders, provided that any such notice may state
that no representation is made as to the correctness of such numbers either as
printed on the Securities or as contained in any notice of redemption and that
reliance may be placed only on the other identification numbers printed on the
Securities. Any such redemption shall not be affected by any defect in or
omission of such numbers.

                                  ARTICLE FOUR

                           SATISFACTION AND DISCHARGE

SECTION 401. Satisfaction and Discharge of Indenture.

         This Indenture shall upon Company Request cease to be of further effect
(except as to any surviving rights of registration of transfer or exchange of
Securities herein expressly provided for), and the Trustee, at the expense of
the Company, shall execute, without recourse, representation or warranty of any
kind, proper instruments acknowledging satisfaction and discharge of this
Indenture, when

         (1) either

            (A) all Securities theretofore authenticated and delivered (other
         than (i) Securities which have been destroyed, lost or stolen and which
         have been replaced or paid as provided in Section 306 and (ii)
         Securities for whose payment money has theretofore been deposited in
         trust or segregated and held in trust by the Company and thereafter
         repaid to the Company or discharged from such trust, as provided in
         Section 1003) have been delivered to the Trustee for cancellation; or

            (B) all such Securities not theretofore delivered to the Trustee for
         cancellation

                  (i) have become due and payable, or

                  (ii) will become due and payable at their Stated Maturity
            within one year, or

                  (iii) are to be called for redemption within one year under
            arrangements satisfactory to the Trustee for the giving of notice of
            redemption by the Trustee in the name, and at the expense, of the
            Company,


                                       28
<PAGE>   36
            and the Company, in the case of (i), (ii) or (iii) above, has
            deposited or caused to be deposited with the Trustee as trust funds
            in trust for the purpose money in an amount sufficient to pay and
            discharge the entire indebtedness on such Securities not theretofore
            delivered to the Trustee for cancellation, for principal and any
            premium and interest to the date of such deposit (in the case of
            Securities which have become due and payable) or to the Stated
            Maturity or Redemption Date, as the case may be;

            (2) the Company has paid or caused to be paid all other sums payable
      hereunder by the Company; and

            (3)the Company has delivered to the Trustee an Officers' Certificate
      and an Opinion of Counsel, each stating that all conditions precedent
      herein provided for relating to the satisfaction and discharge of this
      Indenture have been complied with.

            Notwithstanding the satisfaction and discharge of this Indenture,
the obligations of the Company to the Trustee under Section 607, the obligations
of the Trustee to any Authenticating Agent under Section 614 and, if money shall
have been deposited with the Trustee pursuant to subclause (B) of Clause (1) of
this Section, the obligations of the Trustee under Section 402 and the last
paragraph of Section 1003 shall survive.

SECTION 402. Application of Trust Money.

            Subject to the provisions of the last paragraph of Section 1003, all
money deposited with the Trustee pursuant to Section 401 shall be held in trust
and applied by it, in accordance with the provisions of the Securities and this
Indenture, to the payment, either directly or through any Paying Agent
(including the Company acting as its own Paying Agent) as the Trustee may
determine, to the Persons entitled thereto, of the principal and any premium and
interest for whose payment such money has been deposited with the Trustee.

                                  ARTICLE FIVE

                                    REMEDIES

SECTION 501. Events of Default.

         "Event of Default", wherever used herein with respect to Securities of
any series, means any one of the following events (whatever the reason for such
Event of Default and whether it shall be voluntary or involuntary or be effected
by operation of law or pursuant to any judgment, decree or order of any court or
any order, rule or regulation of any administrative or governmental body):

         (1)default in the payment of any interest upon any Security of that
      series when it becomes due and payable, and continuance of such default
      for a period of 30 days; or

         (2) default in the payment of the principal of or any premium on any
      Security of that series at its Maturity no grace period; or

                                       29
<PAGE>   37
         (3) default in the deposit of any sinking fund payment, when and as due
      by the terms of a Security of that series; or

         (4)default in the performance, or breach, of any covenant or warranty
      of the Company in this Indenture (other than a covenant or warranty a
      default in whose performance or whose breach is elsewhere in this Section
      specifically dealt with or which has expressly been included in this
      Indenture solely for the benefit of series of Securities other than that
      series), and continuance of such default or breach for a period of 60 days
      after there has been given, by registered or certified mail, to the
      Company by the Trustee or to the Company and the Trustee by the Holders of
      at least 10% in principal amount of the Outstanding Securities of that
      series a written notice specifying such default or breach and requiring it
      to be remedied and stating that such notice is a "Notice of Default"
      hereunder; or

         (5)the entry by a court having jurisdiction in the premises of (A) a
      decree or order for relief in respect of the Company in an involuntary
      case or proceeding under any applicable Swiss bankruptcy, insolvency,
      reorganization or other similar law or (B) a decree or order appointing a
      custodian, receiver, liquidator, assignee, trustee, sequestrator or other
      similar official of the Company or of any substantial part of its
      property, or ordering the winding up or liquidation of its affairs, and
      the continuance of any such decree or order for relief or any such other
      decree or order unstayed and in effect for a period of 60 consecutive
      days; or

         (6)the commencement by the Company of a voluntary case or proceeding
      under any applicable Swiss bankruptcy, insolvency, reorganization or other
      similar law or of any other case or proceeding to be adjudicated a
      bankrupt or insolvent, or the consent by it to the entry of a decree or
      order for relief in respect of the Company in an involuntary case or
      proceeding under any applicable Swiss bankruptcy, insolvency,
      reorganization or other similar law or to the commencement of any
      bankruptcy or insolvency case or proceeding against it, or the filing by
      it of a petition or answer or consent seeking reorganization or relief
      under any applicable Swiss law, or the consent by it to the filing of such
      petition or to the appointment of or taking possession by a custodian,
      receiver, liquidator, assignee, trustee, sequestrator or other similar
      official of the Company or of any substantial part of its property, or the
      making by it of an assignment for the benefit of creditors, or the taking
      of corporate action by the Company in furtherance of any such action; or

         (7) any other Event of Default provided with respect to Securities of
      that series.

SECTION 502. Acceleration of Maturity; Rescission and Annulment.

         If an Event of Default (other than an Event of Default specified in
Section 501(5) or 501(6)) with respect to Securities of any series at the time
Outstanding occurs and is continuing, then in every such case the Trustee or the
Holders of not less than 25% in principal amount of the Outstanding Securities
of that series may declare the principal amount of all the Securities of that
series (or, if any Securities of that series are Original Issue Discount
Securities, such portion of the principal amount of such Securities as may be
specified by the terms thereof) to be due and payable immediately, by a notice
in writing to the Company (and to the Trustee if given by Holders), and upon any
such declaration such principal amount (or specified amount) shall become
immediately due and payable. If an Event of Default specified in Section 501(5)
or 501 (6) with respect to Securities of any series at the time Outstanding
occurs, the principal amount of

                                       30
<PAGE>   38
all the Securities of that series (or, if any Securities of that series are
Original Issue Discount Securities, such portion of the principal amount of such
Securities as may be specified by the terms thereof) shall automatically, and
without any declaration or other action on the part of the Trustee or any
Holder, become immediately due and payable.

         At any time after such a declaration of acceleration with respect to
Securities of any series has been made and before a judgment or decree for
payment of the money due has been obtained by the Trustee as hereinafter in this
Article provided, the Holders of a majority in principal amount of the
Outstanding Securities of that series, by written notice to the Company and the
Trustee, may rescind and annul such declaration and its consequences if

         (1) the Company has paid or deposited with the Trustee a sum sufficient
      to pay

            (A) all overdue interest on all Securities of that series,

            (B) the principal of (and premium, if any, on) any Securities of
         that series which have become due otherwise than by such declaration of
         acceleration and any interest thereon at the rate or rates prescribed
         therefor in such Securities,

            (C) to the extent that payment of such interest is lawful, interest
         upon overdue interest at the rate or rates prescribed therefor in such
         Securities, and

            (D) all sums paid or advanced by the Trustee hereunder and the
         reasonable compensation, expenses, disbursements and advances of the
         Trustee, its agents and counsel;

         and

         (2)all Events of Default with respect to Securities of that series,
      other than the non-payment of the principal of Securities of that
      series which have become due solely by such declaration of
      acceleration, have been cured or waived as provided in Section 513.

         No such rescission shall affect any subsequent default or impair any
right consequent thereon.

SECTION 503. Collection of Indebtedness and Suits for Enforcement by Trustee.

         The Company covenants that if

         (1)default is made in the payment of any interest on any Security when
      such interest becomes due and payable and such default continues for a
      period of 30 days, or

         (2) default is made in the payment of the principal of (or premium, if
      any, on) any Security at the Maturity thereof,

the Company will, upon demand of the Trustee, pay to it, for the benefit of the
Holders of such Securities, the whole amount then due and payable on such
Securities for principal and any premium and interest and, to the extent that
payment of such interest shall be legally enforceable, interest on any overdue
principal and premium and on any overdue interest, at the rate or rates


                                       31
<PAGE>   39
prescribed therefor in such Securities, and, in addition thereto, such further
amount as shall be sufficient to cover the costs and expenses of collection,
including the reasonable compensation, expenses, disbursements and advances of
the Trustee, its agents and counsel.

         If an Event of Default with respect to Securities of any series occurs
and is continuing, the Trustee may in its discretion proceed to protect and
enforce its rights and the rights of the Holders of Securities of such series by
such appropriate judicial proceedings as the Trustee shall deem most effectual
to protect and enforce any such rights, whether for the specific enforcement of
any covenant or agreement in this Indenture or in aid of the exercise of any
power granted herein, or to enforce any other proper remedy.

SECTION 504. Trustee May File Proofs of Claim.

         In case of any judicial proceeding relative to the Company (or any
other obligor upon the Securities), its property or its creditors, the Trustee
shall be entitled and empowered, by intervention in such proceeding or
otherwise, to take any and all actions authorized under the Trust Indenture Act
in order to have claims of the Holders and the Trustee allowed in any such
proceeding. In particular, the Trustee shall be authorized to participate as a
member, voting or otherwise, of any official committee appointed on such matter,
to collect and receive any moneys or other property payable or deliverable on
any such claims and to distribute the same; and any custodian, receiver,
assignee, trustee, liquidator, sequestrator or other similar official in any
such judicial proceeding is hereby authorized by each Holder to make such
payments to the Trustee and, in the event that the Trustee shall consent to the
making of such payments directly to the Holders, to pay to the Trustee any
amount due it for the reasonable compensation, expenses, disbursements and
advances of the Trustee, its agents and counsel, and any other amounts due the
Trustee under Section 607.

         No provision of this Indenture shall be deemed to authorize the Trustee
to authorize or consent to or accept or adopt on behalf of any Holder any plan
of reorganization, arrangement, adjustment or composition affecting the
Securities or the rights of any Holder thereof or to authorize the Trustee to
vote in respect of the claim of any Holder in any such proceeding; provided,
however, that the Trustee may, on behalf of the Holders, vote for the election
of a trustee in bankruptcy or similar official and be a member of a creditors'
or other similar committee.

SECTION 505. Trustee May Enforce Claims Without Possession of Securities.

         All rights of action and claims under this Indenture or the Securities
may be prosecuted and enforced by the Trustee without the possession of any of
the Securities or the production thereof in any proceeding relating thereto, and
any such proceeding instituted by the Trustee shall be brought in its own name
as trustee of an express trust, and any recovery of judgment shall, after
provision for the payment of the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel, be for the
ratable benefit of the Holders of the Securities in respect of which such
judgment has been recovered.

SECTION 506. Application of Money Collected.

         Any money collected by the Trustee pursuant to this Article shall be
applied in the following order, at the date or dates fixed by the Trustee and,
in case of the distribution of such

                                       32
<PAGE>   40
money on account of principal or any premium or interest, upon presentation of
the Securities and the notation thereon of the payment if only partially paid
and upon surrender thereof if fully paid:

            FIRST: To the payment of all amounts due the Trustee under Section
      607; and

            SECOND: To the payment of the amounts then due and unpaid for
      principal of and any premium and interest on the Securities in respect of
      which or for the benefit of which such money has been collected, ratably,
      without preference or priority of any kind, according to the amounts due
      and payable on such Securities for principal and any premium and interest,
      respectively.

SECTION 507. Limitation on Suits.

         No Holder of any Security of any series shall have any right to
institute any proceeding, judicial or otherwise, with respect to this Indenture,
or for the appointment of a receiver or trustee, or for any other remedy
hereunder, unless

         (1)such Holder has previously given written notice to the Trustee of a
      continuing Event of Default with respect to the Securities of that series;

         (2)the Holders of not less than 25% in principal amount of the
      Outstanding Securities of that series shall have made written request to
      the Trustee to institute proceedings in respect of such Event of Default
      in its own name as Trustee hereunder;

         (3)such Holder or Holders have offered to the Trustee reasonable
      indemnity against the costs, expenses and liabilities to be incurred in
      compliance with such request;

         (4)the Trustee for 60 days after its receipt of such notice, request
      and offer of indemnity has failed to institute any such proceeding; and

         (5)no direction inconsistent with such written request has been given
      to the Trustee during such 60-day period by the Holders of a majority in
      principal amount of the Outstanding Securities of that series;

it being understood and intended that no one or more of such Holders shall have
any right in any manner whatever by virtue of, or by availing of, any provision
of this Indenture to affect, disturb or prejudice the rights of any other of
such Holders, or to obtain or to seek to obtain priority or preference over any
other of such Holders or to enforce any right under this Indenture, except in
the manner herein provided and for the equal and ratable benefit of all of such
Holders.

SECTION 508. Unconditional Right of Holders to Receive Principal, Premium and
Interest and to Convert.

         Notwithstanding any other provision in this Indenture, the Holder of
any Security shall have the right, which is absolute and unconditional, to
receive payment of the principal of and any premium and (subject to Section 307)
interest on such Security on the respective Stated Maturities expressed in such
Security (or, in the case of redemption, on the Redemption Date), and, if the
terms of such Security so provide, to convert such Security in accordance with
its

                                       33
<PAGE>   41
terms, and to institute suit for the enforcement of any such payment and, if
applicable, any such right to convert, and such rights shall not be impaired
without the consent of such Holder.

SECTION 509. Restoration of Rights and Remedies.

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

SECTION 510. Rights and Remedies Cumulative.

         Except as otherwise provided with respect to the replacement or payment
of mutilated, destroyed, lost or stolen Securities in the last paragraph of
Section 306, no right or remedy herein conferred upon or reserved to the Trustee
or 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 511. Delay or Omission Not Waiver.

         No delay or omission of the Trustee or of any Holder of any Securities
to exercise any right or remedy accruing upon any Event of Default shall impair
any such right or remedy or constitute a waiver of any such Event of Default or
an acquiescence therein. Every right and remedy given by this Article or by law
to the Trustee or to the Holders may be exercised from time to time, and as
often as may be deemed expedient, by the Trustee or by the Holders, as the case
may be.

SECTION 512. Control by Holders.

         The Holders of a majority in principal amount of the Outstanding
Securities of any series shall have the right to direct the time, method and
place of conducting any proceeding for any remedy available to the Trustee, or
exercising any trust or power conferred on the Trustee, with respect to the
Securities of such series, provided that

         (1) such direction shall not be in conflict with any rule of law or
      with this Indenture, and

         (2)the Trustee may take any other action deemed proper by the Trustee
      which is not inconsistent with such direction.

                                       34
<PAGE>   42
SECTION 513. Waiver of Past Defaults.

         The Holders of not less than a majority in principal amount of the
Outstanding Securities of any series may on behalf of the Holders of all the
Securities of such series waive any past default hereunder with respect to such
series and its consequences, except a default

         (1) in the payment of the principal of or any premium or interest on
      any Security of such series, or

         (2)in respect of a covenant or provision hereof which under Article
      Nine cannot be modified or amended without the consent of the Holder of
      each Outstanding Security of such series affected.

         Upon any such waiver, such default shall cease to exist, and any Event
of Default arising therefrom shall be deemed to have been cured, for every
purpose of this Indenture; but no such waiver shall extend to any subsequent or
other default or impair any right consequent thereon.

SECTION 514. Undertaking for Costs.

         In any suit for the enforcement of any right or remedy under this
Indenture, or in any suit against the Trustee for any action taken, suffered or
omitted by it as Trustee, a court may require any party litigant in such suit to
file an undertaking to pay the costs of such suit, and may assess costs against
any such party litigant, in the manner and to the extent provided in the Trust
Indenture Act; provided that neither this Section nor the Trust Indenture Act
shall be deemed to authorize any court to require such an undertaking or to make
such an assessment in any suit instituted by the Company.

SECTION 515. Waiver of Usury, 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 usury, stay or extension law wherever
enacted, now or at any time hereafter in force, which may affect the covenants
or the performance of this Indenture; 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 Trustee, but will suffer and permit the execution of
every such power as though no such law had been enacted.

                                  ARTICLE SIX

                                   THE TRUSTEE

SECTION 601. Certain Duties and Responsibilities.

         The duties and responsibilities of the Trustee shall be as provided by
the Trust Indenture Act. Notwithstanding the foregoing, no provision of this
Indenture shall require the Trustee 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 it shall have reasonable

                                       35
<PAGE>   43
grounds for believing that repayment of such funds or adequate indemnity against
such risk or liability is not reasonably assured to it. Whether or not therein
expressly so provided, every provision of this Indenture relating to the conduct
or affecting the liability of or affording protection to the Trustee shall be
subject to the provisions of this Section.

SECTION 602. Notice of Defaults.

         If a default occurs hereunder with respect to Securities of any series,
the Trustee shall give the Holders of Securities of such series notice of such
default as and to the extent provided by the Trust Indenture Act; provided,
however, that in the case of any default of the character specified in Section
501(4) with respect to Securities of such series, no such notice to Holders
shall be given until at least 30 days after the occurrence thereof. For the
purpose of this Section, the term "default" means any event which is, or after
notice or lapse of time or both would become, an Event of Default with respect
to Securities of such series.

SECTION 603. Certain Rights of Trustee.

         Subject to the provisions of Section 601:

         (1)the Trustee 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;

         (2)any request or direction of the Company mentioned herein shall be
      sufficiently evidenced by a Company Request or Company Order, and any
      resolution of the Board of Directors shall be sufficiently evidenced by a
      Board Resolution;

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

         (4)the Trustee 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;

         (5)the Trustee shall be under no obligation to exercise any of the
      rights or powers vested in it by this Indenture at the request or
      direction of any of the Holders pursuant to this Indenture, unless such
      Holders shall have offered to the Trustee reasonable security or indemnity
      against the costs, expenses and liabilities which might be incurred by it
      in compliance with such request or direction;

         (6)the Trustee 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 Trustee, in its discretion, may make such further
      inquiry or investigation into such facts or matters as it may see fit,
      and, if the Trustee shall determine to make such

                                       36
<PAGE>   44
      further inquiry or investigation, it shall be entitled to examine the
      books, records and premises of the Company, personally or by agent or
      attorney;

         (7)the Trustee may execute any of the trusts or powers hereunder or
      perform any duties hereunder either directly or by or through agents or
      attorneys and the Trustee shall not be responsible for any misconduct or
      negligence on the part of any agent or attorney appointed with due care by
      it hereunder;

         (8)the Trustee shall not be liable for any action taken, suffered or
      omitted by it in good faith and believed by it to be authorized or within
      the discretion or rights or powers conferred upon it by this Indenture;
      and

         (9)except during the continuance of an Event of Default, the Trustee
      need perform only those duties as are specifically set forth in this
      Indenture.

         The Trustee shall not be required 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 it shall have
reasonable grounds for believing that repayment of such funds or adequate
indemnity against such risk or liability is not reasonably assured to it.

         In the event that an Event of Default has occurred and is continuing,
the Trustee shall, in the exercise of its power, use the degree of care of a
prudent person in similar circumstances in the conduct of his or her own
affairs.

SECTION 604. Not Responsible for Recitals or Issuance of Securities.

         The recitals contained herein and in the Securities, except the
Trustee's certificates of authentication, shall be taken as the statements of
the Company, and neither the Trustee nor any Authenticating Agent assumes any
responsibility for their correctness. The Trustee makes no representations as to
the validity or sufficiency of this Indenture or of the Securities. Neither the
Trustee nor any Authenticating Agent shall be accountable for the use or
application by the Company of Securities or the proceeds thereof.

SECTION 605. May Hold Securities.

         The Trustee, any Authenticating Agent, any Paying Agent, any Security
Registrar or any other agent of the Company, in its individual or any other
capacity, may become the owner or pledgee of Securities and, subject to Sections
608 and 613, may otherwise deal with the Company with the same rights it would
have if it were not Trustee, Authenticating Agent, Paying Agent, Security
Registrar or such other agent.

SECTION 606. Money Held in Trust.

         Money held by the Trustee in trust hereunder need not be segregated
from other funds except to the extent required by law. The Trustee shall be
under no liability for interest on any money received by it hereunder except as
otherwise agreed with the Company.

                                       37
<PAGE>   45
SECTION 607. Compensation and Reimbursement.

         The Company agrees

         (1)to pay to the Trustee from time to time reasonable compensation for
      all services rendered by it hereunder (which compensation shall not be
      limited by any provision of law in regard to the compensation of a trustee
      of an express trust);

         (2)except as otherwise expressly provided herein, to reimburse the
      Trustee upon its request for all reasonable expenses, disbursements and
      advances incurred or made by the Trustee in accordance with any provision
      of this Indenture (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 Trustee 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 the trust or trusts hereunder, including the costs and
      expenses of enforcing this Indenture against the Company (including
      Section 607) and defending itself against any claim, whether asserted by
      any Holder or the Company, or liability in connection with the exercise or
      performance of any of its powers or duties hereunder.

         To secure the Company's payment obligations in this Section 607, the
Trustee shall have a lien prior to the Securities on all money or property held
or collected by the Trustee, except that held in trust to pay the principal
amount, premium, if any, or interest, if any, as the case may be, on particular
Securities.

         The Company's payment obligations pursuant to this Section 607 shall
survive the discharge of this Indenture. When the Trustee incurs expenses after
the occurrence of a Default specified in Section 501(5) or (6), the expenses are
intended to constitute expenses of administration under any applicable law.

SECTION 608. Conflicting Interests.

         If the Trustee has or shall acquire a conflicting interest within the
meaning of the Trust Indenture Act, the Trustee shall either eliminate such
interest or resign, to the extent and in the manner provided by, and subject to
the provisions of, the Trust Indenture Act and this Indenture. To the extent
permitted by such Act, the Trustee shall not be deemed to have a conflicting
interest by virtue of being a trustee under this Indenture with respect to
Securities of more than one series [or a trustee under -- list here any prior
indentures between the Company and the Trustee that have not been satisfied and
discharged and that may be excluded by the proviso to Section 310(b)(1) of the
Trust Indenture Act].

SECTION 609. Corporate Trustee Required; Eligibility.

         There shall at all times be one (and only one) Trustee hereunder with
respect to the Securities of each series, which may be Trustee hereunder for
Securities of one or more other series. Each Trustee shall be a Person that is
eligible pursuant to the Trust Indenture Act to act as such, has a combined
capital and surplus of at least $50,000,000 and has its Corporate Trust

                                       38
<PAGE>   46
Office in the Borough of Manhattan, The City of New York. If any such Person
publishes reports of condition at least annually, pursuant to law or to the
requirements of its supervising or examining authority, then for the purposes of
this Section and to the extent permitted by the Trust Indenture Act, the
combined capital and surplus of such Person 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 Trustee with respect to the Securities of any
series 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 610. Resignation and Removal; Appointment of Successor.

         No resignation or removal of the Trustee and no appointment of a
successor Trustee pursuant to this Article shall become effective until the
acceptance of appointment by the successor Trustee in accordance with the
applicable requirements of Section 611.

         The Trustee may resign at any time with respect to the Securities of
one or more series by giving written notice thereof to the Company. If the
instrument of acceptance by a successor Trustee required by Section 611 shall
not have been delivered to the Trustee within 30 days after the giving of such
notice of resignation, the resigning Trustee may petition any court of competent
jurisdiction for the appointment of a successor Trustee with respect to the
Securities of such series.

         The Trustee may be removed at any time with respect to the Securities
of any series by Act of the Holders of a majority in principal amount of the
Outstanding Securities of such series, delivered to the Trustee and to the
Company.

         If at any time:

         (1)the Trustee shall fail to comply with Section 608 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 Trustee shall cease to be eligible under Section 609 and shall
      fail to resign after written request therefor by the Company or by any
      such Holder, or

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

then, in any such case, (A) the Company by a Board Resolution may remove the
Trustee with respect to all Securities, or (B) subject to Section 514, 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 Trustee with respect to all
Securities and the appointment of a successor Trustee or Trustees.

         If the Trustee shall resign, be removed or become incapable of acting,
or if a vacancy shall occur in the office of Trustee for any cause, with respect
to the Securities of one or more series, the Company, by a Board Resolution,
shall promptly appoint a successor Trustee or

                                       39
<PAGE>   47
Trustees with respect to the Securities of that or those series (it being
understood that any such successor Trustee may be appointed with respect to the
Securities of one or more or all of such series and that at any time there shall
be only one Trustee with respect to the Securities of any particular series) and
shall comply with the applicable requirements of Section 611. If, within one
year after such resignation, removal or incapability, or the occurrence of such
vacancy, a successor Trustee with respect to the Securities of any series shall
be appointed by Act of the Holders of a majority in principal amount of the
Outstanding Securities of such series delivered to the Company and the retiring
Trustee, the successor Trustee so appointed shall, forthwith upon its acceptance
of such appointment in accordance with the applicable requirements of Section
611, become the successor Trustee with respect to the Securities of such series
and to that extent supersede the successor Trustee appointed by the Company. If
no successor Trustee with respect to the Securities of any series shall have
been so appointed by the Company or the Holders and accepted appointment in the
manner required by Section 611, any Holder who has been a bona fide Holder of a
Security of such series for at least six months may, on behalf of himself and
all others similarly situated, petition any court of competent jurisdiction for
the appointment of a successor Trustee with respect to the Securities of such
series.

         The Company shall give notice of each resignation and each removal of
the Trustee with respect to the Securities of any series and each appointment of
a successor Trustee with respect to the Securities of any series to all Holders
of Securities of such series in the manner provided in Section 106. Each notice
shall include the name of the successor Trustee with respect to the Securities
of such series and the address of its Corporate Trust Office.

SECTION 611. Acceptance of Appointment by Successor.

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

         In case of the appointment hereunder of a successor Trustee with
respect to the Securities of one or more (but not all) series, the Company, the
retiring Trustee and each successor Trustee with respect to the Securities of
one or more series shall execute and deliver an indenture supplemental hereto
wherein each successor Trustee shall accept such appointment and which (1) shall
contain such provisions as shall be necessary or desirable to transfer and
confirm to, and to vest in, each successor Trustee all the rights, powers,
trusts and duties of the retiring Trustee with respect to the Securities of that
or those series to which the appointment of such successor Trustee relates, (2)
if the retiring Trustee is not retiring with respect to all Securities, shall
contain such provisions as shall be deemed necessary or desirable to confirm
that all the rights, powers, trusts and duties of the retiring Trustee with
respect to the Securities of that or those series as to which the retiring
Trustee is not retiring shall continue to be vested in the retiring Trustee, and
(3) shall add to or change any of the provisions of this Indenture as shall be
necessary to provide for or facilitate the administration of the trusts
hereunder by more than one Trustee, it being

                                       40
<PAGE>   48
understood that nothing herein or in such supplemental indenture shall
constitute such Trustees co-trustees of the same trust and that each such
Trustee shall be trustee of a trust or trusts hereunder separate and apart from
any trust or trusts hereunder administered by any other such Trustee; and upon
the execution and delivery of such supplemental indenture the resignation or
removal of the retiring Trustee shall become effective to the extent provided
therein and each such successor Trustee, without any further act, deed or
conveyance, shall become vested with all the rights, powers, trusts and duties
of the retiring Trustee with respect to the Securities of that or those series
to which the appointment of such successor Trustee relates; but, on request of
the Company or any successor Trustee, such retiring Trustee shall duly assign,
transfer and deliver to such successor Trustee all property and money held by
such retiring Trustee hereunder with respect to the Securities of that or those
series to which the appointment of such successor Trustee relates.

         Upon request of any such successor Trustee, the Company shall execute
any and all instruments for more fully and certainly vesting in and confirming
to such successor Trustee all such rights, powers and trusts referred to in the
first or second preceding paragraph, as the case may be.

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

SECTION 612. Merger, Conversion, Consolidation or Succession to Business.

         Any corporation into which the Trustee 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 Trustee shall be a party, or any
corporation succeeding to all or substantially all the corporate trust business
of the Trustee, shall be the successor of the Trustee hereunder, provided such
corporation shall be otherwise qualified and eligible under this Article,
without the execution or filing of any paper or any further act on the part of
any of the parties hereto. In case any Securities shall have been authenticated,
but not delivered, by the Trustee then in office, any successor by merger,
conversion or consolidation to such authenticating Trustee may adopt such
authentication and deliver the Securities so authenticated with the same effect
as if such successor Trustee had itself authenticated such Securities.

SECTION 613. Preferential Collection of Claims Against Company.

         If and when the Trustee shall be or become a creditor of the Company
(or any other obligor upon the Securities), the Trustee shall be subject to the
provisions of the Trust Indenture Act regarding the collection of claims against
the Company (or any such other obligor).

SECTION 614. Appointment of Authenticating Agent.

         The Trustee may appoint an Authenticating Agent or Agents with respect
to one or more series of Securities which shall be authorized to act on behalf
of the Trustee to authenticate Securities of such series issued upon original
issue and upon exchange, registration of transfer or partial redemption thereof
or pursuant to Section 306, and Securities so authenticated shall be entitled to
the benefits of this Indenture and shall be valid and obligatory for all
purposes as if authenticated by the Trustee hereunder. Wherever reference is
made in this Indenture to the authentication and delivery of Securities by the
Trustee or the Trustee's certificate of

                                       41
<PAGE>   49
authentication, such reference shall be deemed to include authentication and
delivery on behalf of the Trustee by an Authenticating Agent and a certificate
of authentication executed on behalf of the Trustee by an Authenticating Agent.
Each Authenticating Agent shall be acceptable to the Company and shall at all
times 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 act as Authenticating Agent, having a combined capital and
surplus of not less than $50,000,000 and subject to supervision or examination
by Federal or State authority. If such Authenticating Agent 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 Authenticating Agent 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 an Authenticating Agent shall cease to be
eligible in accordance with the provisions of this Section, such Authenticating
Agent shall resign immediately in the manner and with the effect specified in
this Section.

         Any corporation into which an Authenticating 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 such Authenticating Agent
shall be a party, or any corporation succeeding to the corporate agency or
corporate trust business of an Authenticating Agent, shall continue to be an
Authenticating Agent, provided such corporation shall be otherwise eligible
under this Section, without the execution or filing of any paper or any further
act on the part of the Trustee or the Authenticating Agent.

         An Authenticating Agent may resign at any time by giving written notice
thereof to the Trustee and to the Company. The Trustee may at any time terminate
the agency of an Authenticating Agent by giving written notice thereof to such
Authenticating Agent and to the Company. Upon receiving such a notice of
resignation or upon such a termination, or in case at any time such
Authenticating Agent shall cease to be eligible in accordance with the
provisions of this Section, the Trustee may appoint a successor Authenticating
Agent which shall be acceptable to the Company and shall give notice of such
appointment in the manner provided in Section 106 to all Holders of Securities
of the series with respect to which such Authenticating Agent will serve. Any
successor Authenticating Agent upon acceptance of its appointment hereunder
shall become vested with all the rights, powers and duties of its predecessor
hereunder, with like effect as if originally named as an Authenticating Agent.
No successor Authenticating Agent shall be appointed unless eligible under the
provisions of this Section.

         The Trustee agrees to pay to each Authenticating Agent from time to
time reasonable compensation for its services under this Section, and the
Trustee shall be entitled to be reimbursed for such payments, subject to the
provisions of Section 607.

         If an appointment with respect to one or more series is made pursuant
to this Section, the Securities of such series may have endorsed thereon, in
addition to the Trustee's certificate of authentication, an alternative
certificate of authentication in the following form:

         This is one of the Securities of the series designated therein referred
to in the within-mentioned Indenture.

                                              ..................................
                                                                      As Trustee


                                       42
<PAGE>   50
                                             By................................,
                                                         As Authenticating Agent

                                             By.................................
                                                              Authorized Officer

                                 ARTICLE SEVEN

                HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

SECTION 701. Company to Furnish Trustee Names and Addresses of Holders.

         The Company will furnish or cause to be furnished to the Trustee

         (1)semi-annually, not later than May 15 and November 15 in each year, a
      list, in such form as the Trustee may reasonably require, of the names and
      addresses of the Holders of Securities of each series as of the preceding
      May 1 or November 1, as the case may be, and

         (2)at such other times as the Trustee may request in writing, within 30
      days after the receipt by the Company of any such request, a list of
      similar form and content as of a date not more than 15 days prior to the
      time such list is furnished;

excluding from any such list names and addresses received by the Trustee in its
capacity as Security Registrar.

SECTION 702. Preservation of Information; Communications to Holders.

         The Trustee shall preserve, in as current a form as is reasonably
practicable, the names and addresses of Holders contained in the most recent
list furnished to the Trustee as provided in Section 701 and the names and
addresses of Holders received by the Trustee in its capacity as Security
Registrar. The Trustee may destroy any list furnished to it as provided in
Section 701 upon receipt of a new list so furnished.

         The rights of Holders to communicate with other Holders with respect to
their rights under this Indenture or under the Securities, and the corresponding
rights and privileges of the Trustee, shall be as provided by the Trust
Indenture Act.

         Every Holder of Securities, by receiving and holding the same, agrees
with the Company and the Trustee that neither the Company nor the Trustee nor
any agent of either of them shall be held accountable by reason of any
disclosure of information as to names and addresses of Holders made pursuant to
the Trust Indenture Act.

SECTION 703. Reports by Trustee.

         The Trustee shall transmit to Holders such reports concerning the
Trustee and its actions under this Indenture as may be required pursuant to the
Trust Indenture Act at the times and in the manner provided pursuant thereto.

                                       43
<PAGE>   51
         Reports so required to be transmitted at stated intervals of not more
than 12 months shall be transmitted no later than May 15 in each calendar year,
commencing in 2001.

         A copy of each such report shall, at the time of such transmission to
Holders, be filed by the Trustee with each stock exchange upon which any
Securities are listed, with the Commission and with the Company. The Company
will notify the Trustee when any Securities are listed on any stock exchange.

SECTION 704. Reports by Company.

         The Company shall file with the Trustee and the Commission, and
transmit to Holders, such information, documents and other reports, and such
summaries thereof, as may be required pursuant to the Trust Indenture Act at the
times and in the manner provided pursuant to such Act; provided that any such
information, documents or reports required to be filed with the Commission
pursuant to Section 13 or 15(d) of the Exchange Act shall be filed with the
Trustee within 15 days after the same is so required to be filed with the
Commission.

                                 ARTICLE EIGHT

              CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

SECTION 801. Company May Consolidate, Etc., Only on Certain Terms.

         The Company shall not consolidate with or merge into any other Person
or convey, transfer or lease its properties and assets substantially as an
entirety to any Person, and the Company shall not permit any Person to
consolidate with or merge into the Company or convey, transfer or lease its
properties and assets substantially as an entirety to the Company, unless:

         (1)in case the Company shall consolidate with or merge into another
      Person or convey, transfer or lease its properties and assets
      substantially as an entirety to any Person, the Person formed by such
      consolidation or into which the Company is merged or the Person which
      acquires by conveyance or transfer, or which leases, the properties and
      assets of the Company substantially as an entirety shall be a corporation,
      partnership or trust, shall be organized and validly existing under the
      laws of Switzerland and shall expressly assume, by an indenture
      supplemental hereto, executed and delivered to the Trustee, in form
      satisfactory to the Trustee, the due and punctual payment of the principal
      of and any premium and interest on all the Securities and the performance
      or observance of every covenant of this Indenture on the part of the
      Company to be performed or observed;

         (2)immediately after giving effect to such transaction and treating any
      indebtedness which becomes an obligation of the Company or any Subsidiary
      as a result of such transaction as having been incurred by the Company or
      such Subsidiary at the time of such transaction, no Event of Default, and
      no event which, after notice or lapse of time or both, would become an
      Event of Default, shall have happened and be continuing;

         (3)if, as a result of any such consolidation or merger or such
      conveyance, transfer or lease, properties or assets of the Company would
      become subject to a mortgage, pledge, lien, security interest or other
      encumbrance which would not be permitted by this Indenture, the

                                       44
<PAGE>   52
      Company or such successor Person, as the case may be, shall take such
      steps as shall be necessary effectively to secure the Securities
      equally and ratably with (or prior to) all indebtedness secured
      thereby; and

         (4)the Company has delivered to the Trustee an Officers' Certificate
      and an Opinion of Counsel, each stating that such consolidation, merger,
      conveyance, transfer or lease and, if a supplemental indenture is required
      in connection with such transaction, such supplemental indenture comply
      with this Article and that all conditions precedent herein provided for
      relating to such transaction have been complied with.

         SECTION 802. Successor Substituted.

         Upon any consolidation of the Company with, or merger of the Company
into, any other Person or any conveyance, transfer or lease of the properties
and assets of the Company substantially as an entirety in accordance with
Section 801, the successor Person formed by such consolidation or into which the
Company is merged or to which such conveyance, transfer or lease is made shall
succeed to, and be substituted for, and may exercise every right and power of,
the Company under this Indenture with the same effect as if such successor
Person had been named as the Company herein, and thereafter, except in the case
of a lease, the predecessor Person shall be relieved of all obligations and
covenants under this Indenture and the Securities.

                                  ARTICLE NINE

                             SUPPLEMENTAL INDENTURES

SECTION 901. Supplemental Indentures Without Consent of Holders.

         Without the consent of any Holders, the Company, when authorized by a
Board Resolution, and the Trustee, at any time and from time to time, may enter
into one or more indentures supplemental hereto, in form satisfactory to the
Trustee, 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 Securities; or

         (2)to add to the covenants of the Company for the benefit of the
      Holders of all or any series of Securities (and if such covenants are to
      be for the benefit of less than all series of Securities, stating that
      such covenants are expressly being included solely for the benefit of such
      series) or to surrender any right or power herein conferred upon the
      Company; or

         (3)to add any additional Events of Default for the benefit of the
      Holders of all or any series of Securities (and if such additional Events
      of Default are to be for the benefit of less than all series of
      Securities, stating that such additional Events of Default are expressly
      being included solely for the benefit of such series); or

         (4)to add to or change any of the provisions of this Indenture to such
      extent as shall be necessary to permit or facilitate the issuance of
      Securities in bearer form, registrable or not

                                       45
<PAGE>   53
      registrable as to principal, and with or without interest coupons, or
      to permit or facilitate the issuance of Securities in uncertificated
      form; or

         (5)to add to, change or eliminate any of the provisions of this
      Indenture in respect of one or more series of Securities, provided that
      any such addition, change or elimination (A) shall neither (i) apply to
      any Security of any series created prior to the execution of such
      supplemental indenture and entitled to the benefit of such provision nor
      (ii) modify the rights of the Holder of any such Security with respect to
      such provision or (B) shall become effective only when there is no such
      Security Outstanding; or

         (6) to secure the Securities; or

         (7) to establish the form or terms of Securities of any series as
      permitted by Sections 201 and 301; or

         (8)to evidence and provide for the acceptance of appointment hereunder
      by a successor Trustee with respect to the Securities of one or more
      series and to add to or change any of the provisions of this Indenture as
      shall be necessary to provide for or facilitate the administration of the
      trusts hereunder by more than one Trustee, pursuant to the requirements of
      Section 611; or

         (9)to add to or change any of the provisions of this Indenture with
      respect to any Securities that by their terms may be converted into
      securities or other property other than Securities of the same series and
      of like tenor, in order to permit or facilitate the issuance, payment or
      conversion of such Securities; or

         (10) to cure any ambiguity, to correct or supplement any provision
      herein which may be defective or inconsistent with any other provision
      herein, or to make any other provisions with respect to matters or
      questions arising under this Indenture, provided that such action pursuant
      to this Clause (10) shall not adversely affect the interests of the
      Holders of Securities of any series in any material respect.

SECTION 902. Supplemental Indentures With Consent of Holders.

         With the consent of the Holders of not less than 66 2/3% in principal
amount of the Outstanding Securities of each series affected by such
supplemental indenture, by Act of said Holders delivered to the Company and the
Trustee, the Company, when authorized by a Board Resolution, and the Trustee may
enter into an indenture or indentures supplemental hereto for the purpose of
adding any provisions to or changing in any manner or eliminating any of the
provisions of this Indenture or of modifying in any manner the rights of the
Holders of Securities of such series under this Indenture; provided, however,
that no such supplemental indenture shall, without the consent of the Holder of
each Outstanding Security affected thereby,

         (1)change the Stated Maturity of the principal of, or any installment
      of principal of or interest on, any Security, or reduce the principal
      amount thereof or the rate of interest thereon or any premium payable upon
      the redemption thereof, or reduce the amount of the principal of an
      Original Issue Discount Security or any other Security which would be due
      and payable upon a declaration of acceleration of the Maturity thereof
      pursuant to Section 502, or change any Place of Payment where, or the coin
      or currency in which, any

                                       46
<PAGE>   54
      Security or any premium or interest thereon is payable, or impair the
      right to institute suit for the enforcement of any such payment on or
      after the Stated Maturity thereof (or, in the case of redemption, on or
      after the Redemption Date), or modify the provisions of this Indenture
      with respect to the subordination of the Securities in a manner adverse to
      the Holders, or

         (2)if any Security provides that the Holder may require the Company to
      repurchase or convert such Security, impair such Holder's right to require
      repurchase or conversion of such Security on the terms provided therein,
      or

         (3)reduce the percentage in principal amount of the Outstanding
      Securities of any series, the consent of whose Holders is required for any
      such supplemental indenture, or the consent of whose Holders is required
      for any waiver (of compliance with certain provisions of this Indenture or
      certain defaults hereunder and their consequences) provided for in this
      Indenture, or

         (4)modify any of the provisions of this Section or Section 513, except
      to increase any such percentage or to provide that certain other
      provisions of this Indenture cannot be modified or waived without the
      consent of the Holder of each Outstanding Security affected thereby;
      provided, however, that this clause shall not be deemed to require the
      consent of any Holder with respect to changes in the references to "the
      Trustee" and concomitant changes in this Section and Section 1008, or the
      deletion of this proviso, in accordance with the requirements of Sections
      611 and 901(8).

A supplemental indenture which changes or eliminates any covenant or other
provision of this Indenture which has expressly been included solely for the
benefit of one or more particular series of Securities, or which modifies the
rights of the Holders of Securities of such series with respect to such covenant
or other provision, shall be deemed not to affect the rights under this
Indenture of the Holders of Securities of any other series.

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

SECTION 903. Execution of Supplemental Indentures.

         In executing, or accepting the additional trusts created by, any
supplemental indenture permitted by this Article or the modifications thereby of
the trusts created by this Indenture, the Trustee shall be entitled to receive,
and (subject to Section 601) shall be fully protected in relying upon, an
Opinion of Counsel stating that the execution of such supplemental indenture is
authorized or permitted by this Indenture. The Trustee may, but shall not be
obligated to, enter into any such supplemental indenture which affects the
Trustee's own rights, duties or immunities under this Indenture or otherwise.

SECTION 904. Effect of Supplemental Indentures.

         Upon the execution of any supplemental indenture under this Article,
this Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every Holder
of Securities theretofore or thereafter authenticated and delivered hereunder
shall be bound thereby.


                                       47
<PAGE>   55
SECTION 905. Conformity with Trust Indenture Act.

         Every supplemental indenture executed pursuant to this Article shall
conform to the requirements of the Trust Indenture Act.


SECTION 906. Reference in Securities to Supplemental Indentures.

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


                                   ARTICLE TEN

                                    COVENANTS


SECTION 1001. Payment of Principal, Premium and Interest.

         The Company covenants and agrees for the benefit of each series of
Securities that it will duly and punctually pay the principal of and any premium
and interest on the Securities of that series in accordance with the terms of
the Securities and this Indenture.


SECTION 1002. Maintenance of Office or Agency.

         The Company will maintain in each Place of Payment for any series of
Securities an office or agency where Securities of that series may be presented
or surrendered for payment, where Securities of that series may be surrendered
for registration of transfer or exchange and where notices and demands to or
upon the Company in respect of the Securities of that series and this Indenture
may be served. The Company will give prompt written notice to the Trustee 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 Trustee with the address thereof, such presentations,
surrenders, notices and demands may be made or served at the Corporate Trust
Office of the Trustee, and the Company hereby appoints the Trustee 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 the Securities of one or more series 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 each Place of Payment for Securities of any series for such
purposes. The Company will give prompt written notice to the Trustee of any such
designation or rescission and of any change in the location of any such other
office or agency.


                                       48
<PAGE>   56

SECTION 1003. Money for Securities Payments to Be Held in Trust.

         If the Company shall at any time act as its own Paying Agent with
respect to any series of Securities, it will, on or before each due date of the
principal of or any premium or interest on any of the Securities of that series,
segregate and hold in trust for the benefit of the Persons entitled thereto a
sum sufficient to pay the principal and any premium and interest so becoming due
until such sums shall be paid to such Persons or otherwise disposed of as herein
provided and will promptly notify the Trustee of its action or failure so to
act.

         Whenever the Company shall have one or more Paying Agents for any
series of Securities, it will, prior to each due date of the principal of or any
premium or interest on any Securities of that series, deposit with a Paying
Agent a sum sufficient to pay such amount, such sum to be held as provided by
the Trust Indenture Act, and (unless such Paying Agent is the Trustee) the
Company will promptly notify the Trustee of its action or failure so to act.

         The Company will cause each Paying Agent for any series of Securities
other than the Trustee to execute and deliver to the Trustee an instrument in
which such Paying Agent shall agree with the Trustee, subject to the provisions
of this Section, that such Paying Agent will (1) comply with the provisions of
the Trust Indenture Act applicable to it as a Paying Agent and (2) during the
continuance of any default by the Company (or any other obligor upon the
Securities of that series) in the making of any payment in respect of the
Securities of that series, upon the written request of the Trustee, forthwith
pay to the Trustee all sums held in trust by such Paying Agent for payment in
respect of the Securities of that series.

         The Company may at any time, for the purpose of obtaining the
satisfaction and discharge of this Indenture or for any other purpose, pay, or
by Company Order direct any Paying Agent to pay, to the Trustee all sums held in
trust by the Company or such Paying Agent, such sums to be held by the Trustee
upon the same trusts as those upon which such sums were held by the Company or
such Paying Agent; and, upon such payment by any Paying Agent to the Trustee,
such Paying Agent shall be released from all further liability with respect to
such money.

         Any money deposited with the Trustee or any Paying Agent, or then held
by the Company, in trust for the payment of the principal of or any premium or
interest on any Security of any series and remaining unclaimed for two years
after such principal, premium or interest has become due and payable shall be
paid to the Company on Company Request, or (if then held by the Company) shall
be discharged from such trust; and the Holder of such Security shall thereafter,
as an unsecured general creditor, look only to the Company for payment thereof,
and all liability of the Trustee or such Paying Agent with respect to such trust
money, and all liability of the Company as trustee thereof, shall thereupon
cease.


SECTION 1004. Statement by Officers as to Default.

         The Company will deliver to the Trustee, within 120 days after the end
of each fiscal year of the Company ending after the date hereof, an Officers'
Certificate, 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 of this Indenture (without regard to any period of
grace or requirement of notice provided hereunder) and, if the Company shall be
in default, specifying all such defaults and the nature and status thereof of
which they may have knowledge.

                                       49
<PAGE>   57


SECTION 1005. Existence.

         Subject to Article Eight, the Company will do or cause to be done all
things necessary to preserve and keep in full force and effect its existence,
rights (charter and statutory) and franchises; provided, however, that the
Company shall not be required to preserve any such right or franchise if the
Board of Directors shall determine that the preservation thereof is no longer
desirable in the conduct of the business of the Company and that the loss
thereof is not disadvantageous in any material respect to the Holders.


SECTION 1006. Payment of Taxes and Other Claims.

         The Company will pay or discharge or cause to be paid or discharged,
before the same shall become delinquent, (1) all taxes, assessments and
governmental charges levied or imposed upon the Company or any Subsidiary or
upon the income, profits or property of the Company or any Subsidiary, and (2)
all lawful claims for labor, materials and supplies which, if unpaid, might by
law become a lien upon the property of the Company or any Subsidiary; provided,
however, that the Company shall not be required to pay or discharge or cause to
be paid or discharged any such tax, assessment, charge or claim whose amount,
applicability or validity is being contested in good faith by appropriate
proceedings.


SECTION 1007. Payment of Additional Amounts.

         Payments under the Securities will be made without deduction or
withholding for or on account of any present or future tax, duty, assessment or
governmental charge imposed upon or as a result of such payments by Switzerland
or any jurisdiction in which a branch of the Company through which any Security
is issued is located (or any political subdivision or taxing authority thereof
or therein) (a "Relevant Jurisdiction") ("Taxes"), unless required by law. To
the extent any such Taxes are so levied or imposed, the Company will, subject to
the exceptions and limitations set forth below, pay such additional amounts
("Additional Amounts") to the Holder of any Security who is not a resident of
the Relevant Jurisdiction or any political subdivision or taxing authority
thereof or therein as may be necessary in order that every net payment of the
principal of and interest on such Security and any other amounts payable on such
Security, after withholding for or on account of such Taxes imposed upon or as a
result of such payment, will not be less than the amount provided for in such
Security to be then due and payable. However, the Company will not be required
to make any payment of Additional Amounts to any such Holder if such payment can
be made without such deduction or withholding by a paying agent other than the
one required to make such a deduction or withholding. Further, the Company will
not be required to make any payment of Additional Amounts to any such Holder for
or on account of:

                           (i) any such Taxes which would not have been so
                  imposed but for (a) the existence of any present or former
                  connection between such Holder (or between a fiduciary,
                  settler, beneficiary, member or shareholder of such Holder, if
                  such Holder is an estate, a trust, a partnership or a
                  corporation) and Switzerland (or any political subdivision or
                  taxing authority thereof or therein) including, without
                  limitation, such Holder (or such fiduciary, settler,
                  beneficiary, member or shareholder) being or having been a
                  citizen or resident thereof or being or having been engaged in
                  a trade or business or present therein or having, or having
                  had, a permanent establishment therein or (b) the presentation
                  by or on behalf of the

                                       50
<PAGE>   58
                  Holder of any such Security payment on a date more than 15
                  days after the date on which such payment became due and
                  payable or the date on which payment thereof is duly provided
                  for, whichever occurs later;

                           (ii)any estate, inheritance, gift, sales, transfer or
                  personal property tax or any similar tax, duty, assessment or
                  governmental charge;

                           (iii) any Taxes which are payable otherwise than by
                  withholding from payments on or in respect of any Security;

                           (iv)any Taxes which would not have been imposed but
                  for the failure to comply with certification, information or
                  other reporting requirements concerning the nationality,
                  residence or identity of the holder or beneficial owner of
                  such Security, if such compliance is required by statute or by
                  regulation of or on behalf of Switzerland or any political
                  subdivision or taxing authority thereof or therein as a
                  precondition to relief or exemption from such tax, assessment
                  or other governmental charge; or

                           (v) any combination of items (i) through (iv) above;

nor shall Additional Amounts be paid with respect to any payment on a Security
to a Holder who is a fiduciary or partnership or other than the sole beneficial
owner of such payment to the extent such payment would be required to be
included in the income, for tax purposes, of a beneficiary or settlor with
respect to such fiduciary or a member of such partnership or a beneficial owner
who would not have been entitled to the Additional Amounts had such beneficiary,
settlor, member or beneficial owner been the Holder of the Security.

         The provisions of this Section 1007 shall also apply to any Taxes
imposed by any jurisdiction in which a Person into which the Company has merged
or to which the Company has conveyed, transferred or leased its property is
located.

         For purposes of this Section 1007, any references to principal of
and/or interest on Securities shall be deemed to include a reference to any
relevant premium and/or Additional Amounts payable in respect of such
Securities.


                  SECTION 1008. Waiver of Certain Covenants.

         Except as otherwise specified as contemplated by Section 301 for
Securities of such series, the Company may, with respect to the Securities of
any series, omit in any particular instance to comply with any term, provision
or condition set forth in any covenant provided pursuant to Section 301(18),
901(2) or 901(7) for the benefit of the Holders of such series [or in Article
Eight] if before the time for such compliance the Holders of at least a majority
in principal amount of the Outstanding Securities of such series shall, by Act
of such Holders, either waive such compliance in such instance or generally
waive compliance with such term, provision or condition, but no such waiver
shall extend to or affect such term, provision or condition except to the extent
so expressly waived, and, until such waiver shall become effective, the
obligations of the Company and the duties of the Trustee in respect of any such
term, provision or condition shall remain in full force and effect.


                                       51
<PAGE>   59

                                 ARTICLE ELEVEN

                            REDEMPTION OF SECURITIES


SECTION 1101. Applicability of Article.

         Securities of any series which are redeemable before their Stated
Maturity shall be redeemable in accordance with their terms and (except as
otherwise specified as contemplated by Section 301 for such Securities) in
accordance with this Article.


SECTION 1102. Election to Redeem; Notice to Trustee.

         The election of the Company to redeem any Securities shall be evidenced
by a Board Resolution or in another manner specified as contemplated by Section
301 for such Securities. In case of any redemption at the election of the
Company of less than all the Securities of any series (including any such
redemption affecting only a single Security), the Company shall, at least 60
days prior to the Redemption Date fixed by the Company (unless a shorter notice
shall be satisfactory to the Trustee), notify the Trustee of such Redemption
Date, of the principal amount of Securities of such series to be redeemed and,
if applicable, of the tenor of the Securities to be redeemed. In the case of any
redemption of Securities prior to the expiration of any restriction on such
redemption provided in the terms of such Securities or elsewhere in this
Indenture, the Company shall furnish the Trustee with an Officers' Certificate
evidencing compliance with such restriction.


SECTION 1103. Selection by Trustee of Securities to Be Redeemed.

         If less than all the Securities of any series are to be redeemed
(unless all the Securities of such series and of a specified tenor are to be
redeemed or unless such redemption affects only a single Security), the
particular Securities to be redeemed shall be selected not more than 60 days
prior to the Redemption Date by the Trustee, from the Outstanding Securities of
such series not previously called for redemption, by such method as the Trustee
shall deem fair and appropriate and which may provide for the selection for
redemption of a portion of the principal amount of any Security of such series,
provided that the unredeemed portion of the principal amount of any Security
shall be in an authorized denomination (which shall not be less than the minimum
authorized denomination) for such Security. If less than all the Securities of
such series and of a specified tenor are to be redeemed (unless such redemption
affects only a single Security), the particular Securities to be redeemed shall
be selected not more than 60 days prior to the Redemption Date by the Trustee,
from the Outstanding Securities of such series and specified tenor not
previously called for redemption in accordance with the preceding sentence.

         If any Security selected for partial redemption is converted at the
Holder's option in part before termination of the conversion right with respect
to the portion of the Security so selected, the converted portion of such
Security shall be deemed (so far as may be) to be the portion selected for
redemption. Securities which have been converted at the Holder's option during a
selection of Securities to be redeemed shall be treated by the Trustee as
Outstanding for the purpose of such selection.

                                       52
<PAGE>   60

         The Trustee shall promptly notify the Company in writing of the
Securities selected for redemption as aforesaid and, in case of any Securities
selected for partial redemption as aforesaid, the principal amount thereof to be
redeemed.

         The provisions of the two preceding paragraphs shall not apply with
respect to any redemption affecting only a single Security, whether such
Security is to be redeemed in whole or in part. In the case of any such
redemption in part, the unredeemed portion of the principal amount of the
Security shall be in an authorized denomination (which shall not be less than
the minimum authorized denomination) for such Security.

         For all purposes of this Indenture, unless the context otherwise
requires, all provisions relating to the redemption of Securities shall relate,
in the case of any Securities redeemed or to be redeemed only in part, to the
portion of the principal amount of such Securities which has been or is to be
redeemed.


SECTION 1104. Notice of Redemption.

         Notice of redemption shall be given by first-class mail, postage
prepaid, mailed not less than 10 nor more than 60 days prior to the Redemption
Date, to each Holder of Securities to be redeemed, at his address appearing in
the Security Register.

         All notices of redemption shall state:

          (1) the Redemption Date,

          (2) the Redemption Price,

          (3) if less than all the Outstanding Securities of any series
     consisting of more than a single Security are to be redeemed, the
     identification (and, in the case of partial redemption of any such
     Securities, the principal amounts) of the particular Securities to be
     redeemed and, if less than all the Outstanding Securities of any series
     consisting of a single Security are to be redeemed, the principal amount of
     the particular Security to be redeemed,

          (4) that on the Redemption Date the Redemption Price will become due
     and payable upon each such Security to be redeemed and, if applicable, that
     interest thereon will cease to accrue on and after said date,

          (5) the place or places where each such Security is to be surrendered
     for payment of the Redemption Price,

          (6) for any Securities that by their terms may be converted at the
     Holder's option, the terms of conversion, the date on which the right to
     convert the Security to be redeemed will terminate and the place or places
     where such Securities may be surrendered for conversion,

          (7) the CUSIP number or numbers, if any, with respect to such
     Securities, and

          (8) that the redemption is for a sinking fund, if such is the case.

                                       53
<PAGE>   61

         Notice of redemption of Securities to be redeemed at the election of
the Company shall be given by the Company or, at the Company's request, by the
Trustee in the name and at the expense of the Company and shall be irrevocable.


SECTION 1105. Deposit of Redemption Price.

         Prior to any Redemption Date, the Company shall deposit with the
Trustee or with a Paying Agent (or, if the Company is acting as its own Paying
Agent, segregate and hold in trust as provided in Section 1003) an amount of
money sufficient to pay the Redemption Price of, and (except if the Redemption
Date shall be an Interest Payment Date) accrued interest on, all the Securities
which are to be redeemed on that date, other than any Securities called for
redemption on that date which have been converted at the Holder's option prior
to the date of such deposit.

         If any Security called for redemption is converted, any money deposited
with the Trustee or with any Paying Agent or so segregated and held in trust for
the redemption of such Security shall (subject to any right of the Holder of
such Security or any Predecessor Security to receive interest as provided in the
last paragraph of Section 307 or in the terms of such Security) be paid to the
Company upon Company Request or, if then held by the Company, shall be
discharged from such trust.


SECTION 1106. Securities Payable on Redemption Date.

         Notice of redemption having been given as aforesaid, the Securities so
to be redeemed shall, on the Redemption Date, become due and payable at the
Redemption Price therein specified, and from and after such date (unless the
Company shall default in the payment of the Redemption Price and accrued
interest) such Securities shall cease to bear interest. Upon surrender of any
such Security for redemption in accordance with said notice, such Security shall
be paid by the Company at the Redemption Price, together with accrued interest
to the Redemption Date; provided, however, that, unless otherwise specified as
contemplated by Section 301, installments of interest whose Stated Maturity is
on or prior to the Redemption Date will be payable to the Holders of such
Securities, or one or more Predecessor Securities, registered as such at the
close of business on the relevant Record Dates according to their terms and the
provisions of Section 307.

         If any Security called for redemption shall not be so paid upon
surrender thereof for redemption, the principal and any premium shall, until
paid, bear interest from the Redemption Date at the rate prescribed therefor in
the Security.


SECTION 1107. Securities Redeemed in Part.

         Any Security which is to be redeemed only in part shall be surrendered
at a Place of Payment therefor (with, if the Company or the Trustee so requires,
due endorsement by, or a written instrument of transfer in form satisfactory to
the Company and the Trustee duly executed by, the Holder thereof or his attorney
duly authorized in writing), and the Company shall execute, and the Trustee
shall authenticate and deliver to the Holder of such Security without service
charge, a new Security or Securities of the same series and of like tenor, of
any authorized denomination as requested by such Holder, in aggregate principal
amount equal to and in exchange for the unredeemed portion of the principal of
the Security so surrendered.

                                       54
<PAGE>   62
SECTION 1108. Optional Redemption for Tax Reasons.

         Unless otherwise specified for a particular series of Securities, the
Company may, on giving not more than 60 nor less than 10 days' notice to the
Trustee (which notice shall be irrevocable), redeem the Securities of any Series
then outstanding at a redemption price equal to the principal amount of the
Securities (or if the Securities are original issue discount securities, such
amount as determined pursuant to the formula set forth in the applicable
indenture supplement) plus any related Additional Amounts (as defined in Section
1007 herein), in each case with respect to the Securities being redeemed, in the
event that: (a) the Company determines that, as a result of any change in or
amendment to the laws (or any regulations or rulings promulgated thereunder) of
a Relevant Jurisdiction (as defined in Section 1007) affecting taxation, or any
change in official position regarding the application or interpretation of such
laws, regulations or rulings, the Company has or will become obligated to pay
Additional Amounts with respect to the Securities of such Series; or (b) a
person located outside of a Relevant Jurisdiction into which the Company is
merged or to which it has conveyed, transferred or leased its property is
required to pay Additional Amounts. Nothing in subsection (b) of this Section
1108 requires the Company to use reasonable measures to avoid the obligation of
pay Additional Amounts in the event of such merger, conveyance, transfer or
lease. The Trustee will notify the Holders at least 20 days prior to the date
fixed for any such redemption. Prior to the giving of any notice of redemption
for tax reasons as described in this paragraph, the Company shall deliver to the
Trustee (i) an Officers' Certificate stating that the Company is entitled to
effect such redemption and setting forth a statement of facts showing that the
conditions precedent to the right of the Company to so redeem have occurred and
(ii) an opinion of counsel to such effect based on such statement of facts;
provided that no such notice of redemption shall be given earlier than 60 days
prior to the earliest date on which the Company would be obligated to pay such
Additional Amounts if a payment in respect of the Securities were then due.


                                 ARTICLE TWELVE

                                  SINKING FUNDS


SECTION 1201. Applicability of Article.

         The provisions of this Article shall be applicable to any sinking fund
for the retirement of Securities of any series except as otherwise specified as
contemplated by Section 301 for such Securities.

         The minimum amount of any sinking fund payment provided for by the
terms of any Securities is herein referred to as a "mandatory sinking fund
payment", and any payment in excess of such minimum amount provided for by the
terms of such Securities is herein referred to as an "optional sinking fund
payment". If provided for by the terms of any Securities, the cash amount of any
sinking fund payment may be subject to reduction as provided in Section 1202.
Each sinking fund payment shall be applied to the redemption of Securities as
provided for by the terms of such Securities.

                                       55
<PAGE>   63


SECTION 1202. Satisfaction of Sinking Fund Payments with Securities.

         The Company (1) may deliver Outstanding Securities of a series (other
than any previously called for redemption) and (2) may apply as a credit
Securities of a series which have been redeemed either at the election of the
Company pursuant to the terms of such Securities or through the application of
permitted optional sinking fund payments pursuant to the terms of such
Securities, in each case in satisfaction of all or any part of any sinking fund
payment with respect to any Securities of such series required to be made
pursuant to the terms of such Securities as and to the extent provided for by
the terms of such Securities; provided that the Securities to be so credited
have not been previously so credited. The Securities to be so credited shall be
received and credited for such purpose by the Trustee at the Redemption Price,
as specified in the Securities so to be redeemed, for redemption through
operation of the sinking fund and the amount of such sinking fund payment shall
be reduced accordingly.


SECTION 1203. Redemption of Securities for Sinking Fund.

         Not less than 60 days prior to each sinking fund payment date for any
Securities, the Company will deliver to the Trustee an Officers' Certificate
specifying the amount of the next ensuing sinking fund payment for such
Securities pursuant to the terms of such Securities, the portion thereof, if
any, which is to be satisfied by payment of cash and the portion thereof, if
any, which is to be satisfied by delivering and crediting Securities pursuant to
Section 1202 and will also deliver to the Trustee any Securities to be so
delivered. Not less than 45 days prior to each such sinking fund payment date,
the Trustee shall select the Securities to be redeemed upon such sinking fund
payment date in the manner specified in Section 1103 and cause notice of the
redemption thereof to be given in the name of and at the expense of the Company
in the manner provided in Section 1104. Such notice having been duly given, the
redemption of such Securities shall be made upon the terms and in the manner
stated in Sections 1106 and 1107.


                                ARTICLE THIRTEEN

                       DEFEASANCE AND COVENANT DEFEASANCE


SECTION 1301. Company's Option to Effect Defeasance or Covenant Defeasance.

         The Company may elect, at its option at any time, to have Section 1302
or Section 1303 applied to any Securities or any series of Securities, as the
case may be, designated pursuant to Section 301 as being defeasible pursuant to
such Section 1302 or 1303, in accordance with any applicable requirements
provided pursuant to Section 301 and upon compliance with the conditions set
forth below in this Article. Any such election shall be evidenced by a Board
Resolution or in another manner specified as contemplated by Section 301 for
such Securities.


SECTION 1302. Defeasance and Discharge.

         Upon the Company's exercise of its option (if any) to have this Section
applied to any Securities or any series of Securities, as the case may be, the
Company shall be deemed to have been discharged from its obligations with
respect to such Securities as provided in this Section on and after the date the
conditions set forth in Section 1304 are satisfied (hereinafter called
"Defeasance"). For this purpose, such Defeasance means that the Company shall be
deemed to

                                       56
<PAGE>   64
have paid and discharged the entire indebtedness represented by such Securities
and to have satisfied all its other obligations under such Securities and this
Indenture insofar as such Securities are concerned (and the Trustee, at the
expense of the Company, shall execute proper instruments acknowledging the
same), subject to the following which shall survive until otherwise terminated
or discharged hereunder: (1) the rights of Holders of such Securities to
receive, solely from the trust fund described in Section 1304 and as more fully
set forth in such Section, payments in respect of the principal of and any
premium and interest on such Securities when payments are due, (2) the Company's
obligations with respect to such Securities under Sections 304, 305, 306, 1002
and 1003, (3) the rights, powers, trusts, duties and immunities of the Trustee
hereunder and (4) this Article. Subject to compliance with this Article, the
Company may exercise its option (if any) to have this Section applied to any
Securities notwithstanding the prior exercise of its option (if any) to have
Section 1303 applied to such Securities.


SECTION 1303. Covenant Defeasance.

         Upon the Company's exercise of its option (if any) to have this Section
applied to any Securities or any series of Securities, as the case may be, (1)
the Company shall be released from its obligations under Section 801(3), Section
1006 and any covenants provided pursuant to Section 301(18), 901(2) or 901(7)
for the benefit of the Holders of such Securities, and (2) the occurrence of any
event specified in Sections 501(4) (with respect to any of Section 801(3),
Section 1006 and any such covenants provided pursuant to Section 301(18), 901(2)
or 901(7)), and 501(7) shall be deemed not to be or result in an Event of
Default, in each case with respect to such Securities as provided in this
Section on and after the date the conditions set forth in Section 1304 are
satisfied (hereinafter called "Covenant Defeasance"). For this purpose, such
Covenant Defeasance means that, with respect to such Securities, the Company may
omit to comply with and shall have no liability in respect of any term,
condition or limitation set forth in any such specified Section (to the extent
so specified in the case of Section 501(4)), whether directly or indirectly by
reason of any reference elsewhere herein to any such Section or by reason of any
reference in any such Section to any other provision herein or in any other
document, but the remainder of this Indenture and such Securities shall be
unaffected thereby.


SECTION 1304. Conditions to Defeasance or Covenant Defeasance.

         The following shall be the conditions to the application of Section
1302 or Section 1303 to any Securities or any series of Securities, as the case
may be:

              (1) The Company shall irrevocably have deposited or caused to be
     deposited with the Trustee (or another trustee which satisfies the
     requirements contemplated by Section 609 and agrees to comply with the
     provisions of this Article applicable to it) as trust funds in trust for
     the purpose of making the following payments, specifically pledged as
     security for, and dedicated solely to, the benefits of the Holders of such
     Securities, (A) money in an amount, or (B) U.S. Government Obligations
     which through the scheduled payment of principal and interest in respect
     thereof in accordance with their terms will provide, not later than one day
     before the due date of any payment, money in an amount, or (C) a
     combination thereof, in each case sufficient, in the opinion of a
     nationally recognized firm of independent public accountants expressed in a
     written certification thereof delivered to the Trustee, to pay and
     discharge, and which shall be applied by the Trustee (or any such other
     qualifying trustee) to pay and discharge, the principal of and any premium
     and interest on such Securities on the respective Stated Maturities, in
     accordance with the terms of this Indenture and such

                                       57
<PAGE>   65
     Securities. As used herein, "U.S. Government Obligation" means (x) any
     security which is (i) a direct obligation of the United States of America
     for the payment of which the full faith and credit of the United States of
     America is pledged or (ii) an obligation of a Person controlled or
     supervised by and acting as an agency or instrumentality of the United
     States of America the payment of which is unconditionally guaranteed as a
     full faith and credit obligation by the United States of America, which, in
     either case (i) or (ii), is not callable or redeemable at the option of the
     issuer thereof, and (y) any depositary receipt issued by a bank (as defined
     in Section 3(a)(2) of the Securities Act) as custodian with respect to any
     U.S. Government Obligation which is specified in Clause (x) above and held
     by such bank for the account of the holder of such depositary receipt, or
     with respect to any specific payment of principal of or interest on any
     U.S. Government Obligation which is so specified and held, provided that
     (except as required by law) such custodian is not authorized to make any
     deduction from the amount payable to the holder of such depositary receipt
     from any amount received by the custodian in respect of the U.S. Government
     Obligation or the specific payment of principal or interest evidenced by
     such depositary receipt.

              (2) In the event of an election to have Section 1302 apply to any
     Securities or any series of Securities, as the case may be, the Company
     shall have delivered to the Trustee an Opinion of Counsel stating that (A)
     the Company has received from, or there has been published by, the Internal
     Revenue Service a ruling or (B) since the date of this instrument, there
     has been a change in the applicable Federal income tax law, in either case
     (A) or (B) to the effect that, and based thereon such opinion shall confirm
     that, the Holders of such Securities will not recognize gain or loss for
     Federal income tax purposes as a result of the deposit, Defeasance and
     discharge to be effected with respect to such Securities and will be
     subject to Federal income tax on the same amount, in the same manner and at
     the same times as would be the case if such deposit, Defeasance and
     discharge were not to occur.

              (3) In the event of an election to have Section 1303 apply to any
     Securities or any series of Securities, as the case may be, the Company
     shall have delivered to the Trustee an Opinion of Counsel to the effect
     that the Holders of such Securities will not recognize gain or loss for
     Federal income tax purposes as a result of the deposit and Covenant
     Defeasance to be effected with respect to such Securities and will be
     subject to Federal income tax on the same amount, in the same manner and at
     the same times as would be the case if such deposit and Covenant Defeasance
     were not to occur.

              (4) The Company shall have delivered to the Trustee an Officers'
     Certificate to the effect that neither such Securities nor any other
     Securities of the same series, if then listed on any securities exchange,
     will be delisted as a result of such deposit.

              (5) No event which is, or after notice or lapse of time or both
     would become, an Event of Default with respect to such Securities or any
     other Securities shall have occurred and be continuing at the time of such
     deposit or, with regard to any such event specified in Sections 501(5) and
     (6), at any time on or prior to the 90th day after the date of such deposit
     (it being understood that this condition shall not be deemed satisfied
     until after such 90th day).

              (6) Such Defeasance or Covenant Defeasance shall not cause the
     Trustee to have a conflicting interest within the meaning of the Trust
     Indenture Act (assuming all Securities are in default within the meaning of
     such Act).

                                       58
<PAGE>   66
              (7) Such Defeasance or Covenant Defeasance shall not result in a
     breach or violation of, or constitute a default under, any other agreement
     or instrument to which the Company is a party or by which it is bound.

              (8) Such Defeasance or Covenant Defeasance shall not result in the
     trust arising from such deposit constituting an investment company within
     the meaning of the Investment Company Act unless such trust shall be
     registered under such Act or exempt from registration thereunder.

              (9) The Company shall have delivered to the Trustee an Officers'
     Certificate and an Opinion of Counsel, each stating that all conditions
     precedent with respect to such Defeasance or Covenant Defeasance have been
     complied with.


SECTION 1305. Deposited Money and U.S. Government Obligations to Be Held in
              Trust; Miscellaneous Provisions.

         Subject to the provisions of the last paragraph of Section 1003, all
money and U.S. Government Obligations (including the proceeds thereof) deposited
with the Trustee or other qualifying trustee (solely for purposes of this
Section and Section 1306, the Trustee and any such other trustee are referred to
collectively as the "Trustee") pursuant to Section 1304 in respect of any
Securities shall be held in trust and applied by the Trustee, in accordance with
the provisions of such Securities and this Indenture, to the payment, either
directly or through any such Paying Agent (including the Company acting as its
own Paying Agent) as the Trustee may determine, to the Holders of such
Securities, of all sums due and to become due thereon in respect of principal
and any premium and interest, but money so held in trust need not be segregated
from other funds except to the extent required by law.

         The Company shall pay and indemnify the Trustee against any tax, fee or
other charge imposed on or assessed against the U.S. Government Obligations
deposited pursuant to Section 1304 or the principal and interest received in
respect thereof other than any such tax, fee or other charge which by law is for
the account of the Holders of Outstanding Securities.

         Anything in this Article to the contrary notwithstanding, the Trustee
shall deliver or pay to the Company from time to time upon Company Request any
money or U.S. Government Obligations held by it as provided in Section 1304 with
respect to any Securities which, in the opinion of a nationally recognized firm
of independent public accountants expressed in a written certification thereof
delivered to the Trustee, are in excess of the amount thereof which would then
be required to be deposited to effect the Defeasance or Covenant Defeasance, as
the case may be, with respect to such Securities.


SECTION 1306. Reinstatement.

         If the Trustee or the Paying Agent is unable to apply any money in
accordance with this Article with respect to any Securities by reason of any
order or judgment of any court or governmental authority enjoining, restraining
or otherwise prohibiting such application, then the obligations under this
Indenture and such Securities from which the Company has been discharged or
released pursuant to Section 1302 or 1303 shall be revived and reinstated as
though no deposit had occurred pursuant to this Article with respect to such
Securities, until such time as the Trustee or Paying Agent is permitted to apply
all money held in trust pursuant to Section 1305

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<PAGE>   67
with respect to such Securities in accordance with this Article; provided,
however, that if the Company makes any payment of principal of or any premium or
interest on any such Security following such reinstatement of its obligations,
the Company shall be subrogated to the rights (if any) of the Holders of such
Securities to receive such payment from the money so held in trust.



         This instrument may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.




                                       60
<PAGE>   68
         IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be
duly executed, as of the day and year first above written.

                                            UBS AG


                                            By    /s/ Robert B. Mills
                                               -----------------------------
                                              Name:  Robert B. Mills
                                              Title:    Managing Director

                                            By    /s/ Robert C. Dinerstein
                                               -----------------------------
                                              Name:  Robert C. Dinerstein
                                              Title:    Managing Director

Attest:


 .........................


                                            U.S. BANK TRUST NATIONAL ASSOCIATION

                                            By    /s/ Peter M. Lagatta
                                              -----------------------------




                                       61
<PAGE>   69




STATE OF NEW YORK           )
                            )  ss.:
COUNTY OF NEW YORK          )


         On the .... day of ..........., ...., before me personally came
 ..........................., to me known, who, being by me duly sworn, did
depose and say that he is ................... . of UBS AG, one of the
corporations described in and which executed the foregoing instrument; and that
he signed his name thereto by like authority.


                                                     ...........................


STATE OF NEW YORK           )
                            )  ss.:
COUNTY OF NEW YORK          )


         On the .... day of ..........., ...., before me personally came
 ..........................., to me known, who, being by me duly sworn, did
depose and say that he is ................... . of UBS AG, one of the
corporations described in and which executed the foregoing instrument; and that
he signed his name thereto by like authority.


                                                     ...........................


STATE OF NEW YORK           )
                            )  ss.:
COUNTY OF NEW YORK          )


         On the .... day of ..........., ...., before me personally came
 ..........................., to me known, who, being by me duly sworn, did
depose and say that he is ................... . of ...........................,
one of the corporations described in and which executed the foregoing
instrument; and that he signed his name thereto by like authority.


                                                     ...........................



                                       62