Document:

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                                   Exh 10.34

                   Purchase Agreement dated November 21, 2000

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                                  $250,000,000

                        L-3 COMMUNICATIONS HOLDINGS, INC.

              5 1/4% CONVERTIBLE SENIOR SUBORDINATED NOTES DUE 2009

                               PURCHASE AGREEMENT

                                                              November 16, 2000

LEHMAN BROTHERS INC.
Three World Financial Center
New York, New York 10285

Ladies and Gentlemen:

     L-3 Communications Holdings, Inc., a Delaware corporation (the "Company"),
proposes, subject to the terms and conditions stated herein, to issue and sell
$250,000,000 in aggregate principal amount of its 5 1/4% Convertible Senior
Subordinated Notes due 2009 (the "Firm Notes") to Lehman Brothers Inc. (the
"Initial Purchaser"). In addition, the Company proposes to grant to the Initial
Purchaser an option (the "Option") to purchase up to an additional $50,000,000
in aggregate principal amount of 5 1/4% Convertible Senior Subordinated Notes
due 2009 to cover over-allotments, if any (the "Optional Notes" and, together
with the Firm Notes, the "Notes").

     The Notes will be convertible into fully paid, nonassessable shares of
common stock of the Company, par value $0.01 per share (the "Common Stock"), on
the terms, and subject to the conditions, set forth in the Indenture. As used
herein, "Conversion Shares" means the shares of Common Stock into which the
Notes are convertible. The Notes will be issued pursuant to an indenture (the
"Indenture") to be dated as of the First Delivery Date (as defined in Section
2(a)), between the Company and The Bank of New York, as Trustee (the "Trustee").
The Company's obligations under the Notes, including the due and punctual
payment of interest on the Notes, will be unconditionally guaranteed (the
"Guarantees") by certain of the present domestic subsidiaries of the Company,
including, as of this date, L-3 Communications Corporation, Hygienetics
Environmental Services, Inc., a Delaware corporation, L-3 Communications ILEX
Systems, Inc, a Delaware corporation, L-3 Communications Aydin Corporation, a
Delaware corporation, MPRI, Inc., a Delaware corporation, L-3 Communications SPD
Technologies, Inc., a Delaware corporation, SPD Holdings, Inc., a Delaware
corporation, SPD Electrical Systems, Inc., a Delaware corporation, SPD
Switchgear, Inc., a Delaware corporation, Pac Ord, Inc., a Delaware corporation,
Henschel, Inc., a Delaware corporation, Power Paragon, Inc., a Delaware
corporation, L-3 Communications ESSCO, Inc., a Delaware corporation
(individually a "Delaware Guarantor" and collectively, the "Delaware
Guarantors"), and Electrodynamics, Inc., an Arizona Corporation, Interstate
Electronics Corporation, a California Corporation, Southern California Microwave
Inc, a California corporation, L-3 Communications Storm Control Systems, Inc., a
California corporation, L-3 Communications DBS Microwave, Inc., a California
corporation and Microdyne Corporation, a Maryland corporation (individually a
"Non-Delaware Guarantor," collectively the "Non-Delaware Guarantors" and,
together with the Delaware Guarantors, the "Guarantors"). As used herein, the
term "Notes" shall include the Guarantees thereof by the Guarantors, unless the
context otherwise requires.

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     The Notes will be offered and sold to the Initial Purchaser without being
registered under the Securities Act of 1933, as amended (the "Securities Act"),
in reliance upon an exemption therefrom. Holders of the Notes (including the
Initial Purchaser and its direct and indirect transferees) will be entitled to
the benefits of a Resale Registration Rights Agreement, dated the First Delivery
Date, between the Company and the Initial Purchaser (the "Registration Rights
Agreement"), pursuant to which the Company will agree to file with the
Securities and Exchange Commission (the "Commission") a registration statement
pursuant to Rule 415 under the Securities Act (the "Registration Statement")
covering the resale of the Notes and the Conversion Shares, and to use its best
efforts to cause the Registration Statement to be declared effective.

     This Agreement, the Indenture, the Notes and the Registration Rights
Agreement are referred to herein collectively as the "Operative Documents."

     This is to confirm the agreement between the Company and the Initial
Purchaser concerning the issue, offer and sale of the Notes.

     1. Representations, Warranties and Agreements of the Company and the
Guarantors. The Company and the Guarantors represent, warrant to and agree with,
the Initial Purchaser that:

     (a) The Company and the Guarantors have prepared an offering memorandum
dated November 16, 2000 (the "Offering Memorandum") setting forth information
concerning the Company, the Notes, the Guarantees, the Registration Rights
Agreement and the Common Stock. Copies of the Offering Memorandum will be
delivered by the Company to the Initial Purchaser pursuant to the terms of this
Agreement. As used in this Agreement, "Offering Memorandum" means the Offering
Memorandum as amended or supplemented. The Offering Memorandum did not as of its
date, and will not as of a Delivery Date (as defined in Section 2(b)), contain
any untrue statement of a material fact or omit to state a material fact
necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading; provided that no
representation or warranty is made as to information contained in or omitted
from the Offering Memorandum in reliance upon and in conformity with written
information furnished to the Company by Lehman Brothers Inc. specifically for
inclusion therein;

     (b) Assuming the accuracy of the representations and warranties of the
Initial Purchaser contained in Section 6 and their compliance with the
agreements set forth therein, it is not necessary, in connection with the
issuance and sale of the Notes to the Initial Purchaser and the offer, resale
and delivery of the Notes by the Initial Purchaser in the manner contemplated by
this Agreement, the Indenture, the Registration Rights Agreement and the
Offering Memorandum, to register the Notes or the Conversion Shares under the
Securities Act or to qualify the Indenture under the Trust Indenture Act;

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     (c) The market-related and customer-related data and estimates included in
the Offering Memorandum are based on or derived from sources which the Company
believes to be reliable and accurate;

     (d) The Company and each of its subsidiaries (as defined in Section 14)
have been duly organized and are validly existing as corporations or limited
liability companies, as applicable, in good standing under the laws of their
respective jurisdictions of organization, are duly qualified to do business and
are in good standing as foreign corporations in each jurisdiction in which their
respective ownership or lease of property or the conduct of their respective
businesses requires such qualification except for such qualification and good
standing the failure of which, individually or in the aggregate, would not
result in a material adverse effect on the condition (financial or other),
business, prospects, properties, stockholders' equity or results of operations
of the Company and its subsidiaries taken as a whole (a "Material Adverse
Effect"), and have all power and authority necessary to own or hold their
respective properties and to conduct the businesses in which they are engaged;

     (e) The Company has an authorized capitalization as set forth in the
Offering Memorandum, and all of the issued and outstanding shares of capital
stock of the Company have been duly and validly authorized and issued, are fully
paid and non-assessable and conform to the description thereof contained in the
Offering Memorandum; and 100% of the issued shares of capital stock of each
Guarantor of the Company have been duly and validly authorized and issued and
are fully paid and non-assessable and (except for directors' qualifying shares)
are owned directly or indirectly by the Company, free and clear of all liens,
encumbrances, equities or claims, other than (A) liens, encumbrances, equities
or claims described in the Offering Memorandum, (B) a pledge of such shares to
secure the Senior Credit Facilities (as described in the Offering Memorandum)
and (C) such other liens, encumbrances, equities or claims as are not,
individually or in the aggregate, material to the Company and its subsidiaries,
taken as a whole;

     (f) The Conversion Shares which are authorized on the date hereof have been
duly and validly authorized and reserved for issuance upon conversion of the
Notes and are free of preemptive rights; and all Conversion Shares, when so
issued and delivered upon such conversion in accordance with the terms of the
Indenture, will be duly and validly authorized and issued, fully paid and
non-assessable and free and clear of all liens, encumbrances, equities or
claims;

     (g) This Agreement has been duly authorized, executed and delivered by the
Company and the Guarantors;

     (h) Except as disclosed in the Offering Memorandum under the heading
"Description of the Notes--Interest Rate Adjustments," the execution, delivery
and performance of this Agreement, the Registration Rights Agreement and the
Indenture by the Company and the Guarantors and the consummation of the
transactions contemplated hereby and thereby, and the

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issuance and delivery of the Notes and the Conversion Shares will not conflict
with, constitute or result in a breach or violation of any of the terms or
provisions of, or constitute a default under, any indenture, mortgage, deed of
trust, loan agreement or other agreement or instrument to which the Company or
any of its subsidiaries is a party or by which the Company or any of its
subsidiaries is bound or to which any of the properties or assets of the Company
or any of its subsidiaries is subject that is material to the financial
condition or prospects of the Company and its subsidiaries, taken as a whole
(collectively, the "Material Agreements"), except for breach of which,
individually, or in the aggregate, would not result in a Material Adverse
Effect, nor will such actions result in any violation of the provisions of the
charter, by-laws or other organizational documents of the Company or any of its
subsidiaries or any material law, statute or any order, rule or regulation of
any court or governmental agency or body having jurisdiction over the Company or
any of its subsidiaries or any of their properties or assets, provided that the
provisions for indemnification and contribution hereunder and thereunder may be
limited by equitable principles and public policy consideration; and except (i)
with respect to the transactions contemplated by the Registration Rights
Agreement as may be required under the Securities Act, the Trust Indenture Act
and the rules and regulations promulgated thereunder, (ii) as required by state
securities or "blue sky" laws, no consent, approval, authorization or order of,
or filing or registration with, any such court or governmental agency or body is
required for the execution, delivery and performance of the Operative Documents
by the Company, and the consummation of the transactions contemplated hereby and
thereby. No qualification of the Indenture under the Trust Indenture Act of
1939, as amended (the "1939 Act"), is required in connection with the sale of
the Notes by the Initial Purchaser;

     (i) The Company and the Guarantors have all necessary corporate right,
power and authority to execute and deliver this Agreement and perform their
obligations hereunder; and this Agreement and the transactions contemplated
hereby have been duly authorized, executed and delivered by the Company and the
Guarantors;

     (j) The Company has all necessary corporate right, power and authority to
execute and deliver the Indenture and perform its obligations thereunder; the
Indenture has been duly authorized by the Company, and upon the effectiveness of
the Registration Statement, will be qualified under the Trust Indenture Act; on
the First Delivery Date (as defined below in Section 2(a)), the Indenture will
have been duly executed and delivered by the Company and, assuming due
authorization, execution and delivery of the Indenture by the Trustee, will
constitute a legally valid and binding agreement of the Company enforceable in
accordance with its terms, except as the enforceability thereof may be limited
by bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and
other similar laws relating to or affecting creditors' rights generally, subject
to general principles of equity and to limitations on availability of equitable
relief, including specific performance (whether considered in a proceeding in
equity or at law) and an implied covenant of good faith and fair dealing; and
the Indenture will conform in all material respects to the description thereof
contained in the Offering Memorandum;

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     (k) The Company has all necessary corporate right, power and authority to
execute and deliver the Registration Rights Agreement and perform its
obligations thereunder; the Registration Rights Agreement and the transactions
contemplated thereby have been duly authorized by the Company; when the
Registration Rights Agreement is duly executed and delivered by the Company
(assuming due authorization, execution and delivery by the Initial Purchaser),
it will be a legally valid and binding agreement of the Company enforceable
against the Company in accordance with its terms, except as the enforceability
thereof may be limited by bankruptcy, insolvency, fraudulent transfer,
reorganization, moratorium and other similar laws relating to or affecting
creditors' rights generally, subject to general principles of equity and to
limitations on availability of equitable relief, including specific performance
(whether considered in a proceeding in equity or at law) and an implied covenant
of good faith and fair dealing, and except with respect to the rights of
indemnification and contribution thereunder, where enforcement thereof may be
limited by federal or state securities laws or the policies underlying such
laws; and the Registration Rights Agreement will conform in all material
respects to the description thereof contained in the Offering Memorandum;

     (l) The Company has all necessary corporate right, power and authority to
execute, issue and deliver the Notes and perform its obligations thereunder; the
Notes have been duly and validly authorized by the Company and when duly
executed by the Company in accordance with the terms of the Indenture and,
assuming due authentication of the Notes by the Trustee, upon delivery to the
Initial Purchaser against payment therefor in accordance with the terms hereof,
will constitute valid and binding obligations of the Company entitled to the
benefits of the Indenture and enforceable in accordance with their terms,
subject to the effects of bankruptcy, insolvency, fraudulent conveyance,
reorganization, moratorium and other similar laws relating to or affecting
creditors' rights generally, general equitable principles (whether considered in
a proceeding in equity or at law) or an implied covenant of good faith and fair
dealing; and the Notes, when issued and delivered, will conform in all material
respects to the description thereof contained in the Offering Memorandum;

     (m) The Guarantees have been duly and validly authorized by the Guarantors
and when duly endorsed on the Notes in accordance with the terms of the
Indenture and, assuming due authentication of the Notes by the Trustee, upon
delivery to the Initial Purchaser against payment therefor in accordance with
the terms hereof, will constitute valid and binding obligations of each of the
Guarantors entitled to the benefits of the Indenture and enforceable in
accordance with their terms, subject to the effects of bankruptcy, insolvency,
fraudulent conveyance, reorganization, moratorium and other similar laws
relating to or affecting creditors' rights generally, general equitable
principals (whether considered in a proceeding in equity or at law) or an
implied covenant of good faith and fair dealing;

     (n) Except (1) as described in the Offering Memorandum, (2) as provided in
the Registration Rights Agreement dated the First Delivery Date, (3) in respect
of the obligation to deliver freely "tradable shares" to the sellers in
connection with the acquisition of the ILEX Systems, Inc. business and (4) other
than the Registration Rights Agreement, dated December 11,

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1998, among the L-3 Communications Corporation and the parties named therein,
there are no contracts, agreements or understandings between the Company and any
person granting such person the right (other than rights which have been waived
or satisfied or rights not exercisable in connection with the Offering
Memorandum) to require the Company to file a registration statement under the
Securities Act with respect to any securities of the Company owned or to be
owned by such person or to require the Company to include such securities in any
securities being registered pursuant to any registration statement filed by the
Company under the Securities Act;

     (o) Except as described in the Offering Memorandum, the Company and the
Guarantors have not sold or issued any Securities with terms that are
substantially similar to the Notes and the Guarantees during the six-month
period preceding the date of the Offering Memorandum, including any sales
pursuant to Rule 144A under, or Regulations D or S of, the Securities Act other
than shares issued pursuant to employee benefit plans, qualified stock option
plans or other employee compensation plans or pursuant to outstanding options,
rights or warrants;

     (p) Neither the Company nor any of its subsidiaries has incurred, since the
date of the latest audited financial statements included or incorporated by
reference in the Offering Memorandum, any liability or obligation, direct or
contingent, or entered into any transaction, in each case not in the ordinary
course of business, that is material to the Company and its subsidiaries taken
as a whole, otherwise than as set forth or contemplated in the Offering
Memorandum; and, since such date, there has not been any material change in the
capital stock or material increase in the short-term or long-term debt of the
Company or any of its subsidiaries or any material adverse change, or any
development involving or which would reasonably be expected to involve a
Material Adverse Effect, otherwise than as described or contemplated in the
Offering Memorandum;

     (q) The historical and pro forma financial statements, together with the
related notes, set forth or incorporated by reference in the Offering Memorandum
comply as to form in all material respects with the requirements of Regulation
S-X under the Securities Act, except as disclosed in the Offering Memorandum.
The historical financial statements of the Company present fairly the financial
condition and results of operations of the entities purported to be shown
thereby, at the dates and for the periods indicated, and have been prepared in
conformity with generally accepted accounting principles applied on a consistent
basis throughout the periods involved;

     (r) PricewaterhouseCoopers LLP, who have certified certain financial
statements of the Company, whose report appears in the Offering Memorandum or is
incorporated by reference therein and who have delivered the initial letter
referred to in Section 5(n) hereof, are independent public accountants as
required by the Securities Act and the Rules and Regulations promulgated
thereunder during the periods covered by the financial statements on which they
reported contained or incorporated in the Offering Memorandum;

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     (s) The Company and each of its subsidiaries have good and marketable title
to all property (real and personal) described in the Offering Memorandum as
being owned by them, free and clear of all liens, claims, security interests or
other encumbrances except such as are described in the Offering Memorandum or,
to the extent that any such liens, claims, security interests or other
encumbrances would not have a Material Adverse Effect (individually or in the
aggregate) and all the material property described in the Offering Memorandum as
being held under lease by the Company and its subsidiaries is held by them under
valid, subsisting and enforceable leases, with only such exceptions as would not
have a Material Adverse Effect (individually or in the aggregate);

     (t) The Company and each of its subsidiaries own or possess adequate rights
to use all material patents, trademarks, service marks, trade names, copyrights,
licenses, inventions, trade secrets and other rights, and all registrations or
applications relating thereto, described in the Offering Memorandum as being
owned by them or necessary for the conduct of their business, except as such
would not have a Material Adverse Effect (individually or in the aggregate), and
the Company is not aware of any pending or threatened claim to the contrary or
any pending or threatened challenge by any other person to the rights of the
Company and its subsidiaries with respect to the foregoing which, if determined
adversely to the Company and its subsidiaries, would have a Material Adverse
Effect (individually or in the aggregate);

     (u) Except as described in the Offering Memorandum, there are no legal or
governmental proceedings pending or, to the knowledge of the Company,
threatened, against the Company or any of its subsidiaries or to which the
Company or any of its subsidiaries is a party or of which any property or assets
of the Company or any of its subsidiaries is the subject which, if determined
adversely to the Company or any of its subsidiaries, are reasonably likely to
cause a Material Adverse Effect;

     (v) No material relationship, direct or indirect, exists between or among
the Company on the one hand, and the directors, officers, stockholders,
customers or suppliers of the Company on the other hand, except as described in
the Offering Memorandum;

     (w) The Company is not involved in any strike, job action or labor dispute
with any group of employees that would have a Material Adverse Effect, and, to
the Company's knowledge, no such action or dispute is threatened;

     (x) Except as disclosed in the Offering Memorandum, the Company is in
compliance in all material respects with all presently applicable provisions of
the Employee Retirement Income Security Act of 1974, as amended, including the
regulations and published interpretations thereunder ("ERISA"); no "reportable
event" (as defined in ERISA) has occurred with respect to any "pension plan" (as
defined in ERISA) subject to Title IV of ERISA for which the Company would have
any material liability; the Company has not incurred and does not expect to
incur any material liability under (i) Title IV of ERISA with respect to
termination of, or withdrawal from, any such "pension plan" or (ii) Sections 412
or 4971 of the Internal Revenue

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Code of 1986, as amended, including the regulations and published
interpretations thereunder (the "Code") (other than contributions in the normal
course which are not in default); and each such "pension plan" for which the
Company would have any liability that is intended to be qualified under Section
401(a) of the Code is so qualified in all material respects and nothing has
occurred, whether by action or by failure to act, which would reasonably be
expected to cause the loss of such qualification;

     (y) The Company and its subsidiaries have filed all federal, state and
local income and franchise tax returns required to be filed through the date
hereof and have paid all taxes due thereon, and no tax deficiency has been
determined adversely to the Company or any of its subsidiaries nor does the
Company have any knowledge of any tax deficiency which, if determined adversely
to the Company and its subsidiaries, might have a Material Adverse Effect;

     (z) Except as disclosed in the Offering Memorandum under the heading
"Description of the Notes--Interest Rate Adjustments," neither the Company nor
any of its subsidiaries (i) is in violation of its charter or by-laws or other
organizational documents, (ii) is in default in any material respect, and no
event has occurred which, with notice or lapse of time or both, would constitute
such a default, in the due performance or observance of any term, covenant or
condition contained in any Material Agreement or (iii) is in violation in any
material respect of any law, ordinance, governmental rule, regulation or court
decree to which it or its property or assets may be subject or has failed to
obtain any material license, permit, certificate, franchise or other
governmental authorization or permit necessary to the ownership of its property
or to the conduct of its business, except as would not, individually or in the
aggregate, have a Material Adverse Effect;

     (aa) To the best of the Company's knowledge, neither the Company nor any of
its subsidiaries, nor any director, officer, agent, employee or other person
associated with or acting on behalf of the Company or any of its subsidiaries,
has used any corporate funds for any unlawful contribution, gift, entertainment
or other unlawful expense relating to political activity; made any direct or
indirect unlawful payment to any foreign or domestic government official or
employee from corporate funds or violated or is in violation of any provision of
the Foreign Corrupt Practices Act of 1977; except as such that would not have a
Material Adverse Effect;

     (bb) There has been no storage, disposal, generation, manufacture,
refinement, transportation, handling or treatment of toxic wastes, medical
wastes, hazardous wastes or hazardous substances by the Company or any of its
subsidiaries (or, to the knowledge of the Company, any of their predecessors in
interest) at, upon or from any of the property now or previously owned or leased
by the Company or its subsidiaries in violation of any applicable law,
ordinance, rule, regulation, order, judgment, decree or permit or which would
require remedial action under any applicable law, ordinance, rule, regulation,
order, judgment, decree or permit, except for any violation or remedial action
which would not have, or would not be reasonably likely to have, singularly or
in the aggregate with all such violations and remedial actions, a Material
Adverse Effect; there has been no material spill, discharge, leak, emission,
injection, escape, dumping or release of any kind onto such property or into the
environment surrounding

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such property of any toxic wastes, medical wastes, solid wastes, hazardous
wastes or hazardous substances due to or caused by the Company or any of its
subsidiaries or with respect to which the Company has knowledge, except for any
such spill, discharge, leak, emission, injection, escape, dumping or release
which would not have or would not be reasonably likely to have, singularly or in
the aggregate with all such spills, discharges, leaks, emissions, injections,
escapes, dumpings and releases, a Material Adverse Effect; and the terms
"hazardous wastes," "toxic wastes," "hazardous substances" and "medical wastes"
shall have the meanings specified in any applicable local, state, federal and
foreign laws or regulations with respect to environmental protection;

     (cc) Neither the Company nor any subsidiary is an "investment company"
within the meaning of such term under the United States Investment Company Act
of 1940 and the rules and regulations of the Commission thereunder;

     (dd) When the Notes are issued and delivered pursuant to this Agreement,
such Notes will not be of the same class (within the meaning of Rule 144A under
the Securities Act) as securities of the Company that are listed on a national
securities exchange registered under Section 6 of the Securities Exchange Act of
1934, as amended (the "Exchange Act") or that are quoted in a U.S. automated
inter-dealer quotation system;

     (ee) Neither the Company nor any of its affiliates (as defined in Rule
501(b) of Regulation D under the Securities Act ("Regulation D")) (other than
the Initial Purchaser, about which no representation is made by the Company),
has, directly or through an agent, engaged in any form of general solicitation
or general advertising in connection with the offering of the Notes (as those
terms are used in Regulation D) under the Securities Act or in any manner
involving a public offering within the meaning of Section 4(2) of the Securities
Act; the Company has not entered into any contractual arrangement with respect
to the distribution of the Notes except for this Agreement and the Company will
not enter into any such arrangement;

     (ff) Neither the Company nor any of its affiliates (other than the Initial
Purchaser, about which no representation is made by the Company), has, directly
or through any agent, sold, offered for sale, solicited offers to buy or
otherwise negotiated in respect of, any "security" (as defined in the Securities
Act) which is or will be integrated with the sale of the Notes in a manner that
would require the registration under the Securities Act of the Notes; and

     (gg) The Company has not taken, directly or indirectly, any action designed
to cause or result in, or which has constituted or which might reasonably be
expected to constitute, the stabilization or manipulation of the price of any
security of the Company in connection with the offering of the Notes.

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     2. Purchase, Sale and Delivery of the Notes.

     (a) The Company and the Guarantors hereby agree, on the basis of the
representations, warranties and agreements of the Initial Purchaser contained
herein and subject to all the terms and conditions set forth herein, to issue
and sell to the Initial Purchaser and, upon the basis of the representations,
warranties and agreements of the Company and the Guarantors herein contained and
subject to all the terms and conditions set forth herein, each Initial Purchaser
agrees, severally and not jointly, to purchase from the Company, at a purchase
price of 97.25% of the principal amount thereof, the principal amount of Notes
set forth opposite the name of the Initial Purchaser in Schedule I hereto. The
Company and the Guarantors shall not be obligated to deliver any of the
securities to be delivered hereunder except upon payment for all of the
securities to be purchased as provided herein.

     Delivery of and payment for the Firm Notes shall be made at the office of
Latham & Watkins, 885 Third Avenue, New York, New York 10022, at 10:00 a.m. (New
York time) on November 21, 2000, or such later date as the Initial Purchaser
shall designate, which date and time may be postponed by agreement between the
Initial Purchaser and the Company or as provided in Section 8 (such date and
time of delivery and payment for the Firm Notes being herein called the "First
Delivery Date"). Delivery of the Firm Notes shall be made to the Initial
Purchaser against payment of the purchase price by the Initial Purchaser.
Payment for the Firm Notes shall be effected either by wire transfer of
immediately available funds to an account with a bank in The City of New York,
the account number and the ABA number for such bank to be provided by the
Company to the Initial Purchaser at least two business days in advance of the
First Delivery Date, or by such other manner of payment as may be agreed by the
Company and the Initial Purchaser.

     (b) Subject to the terms and conditions and in reliance upon the
representations and warranties herein set forth, the Company hereby grants the
Option to the Initial Purchaser to purchase the Optional Notes at the same price
as the Initial Purchaser shall pay for the Firm Notes and the principal amount
of the Optional Notes to be sold to the Initial Purchaser shall be that
principal amount which bears the same ratio to the aggregate principal amount of
Optional Notes being purchased as the principal amount of Firm Notes set forth
opposite the name of the Initial Purchaser in Schedule I hereto (or such number
increased as set forth in Section 8). The Option may be exercised only to cover
over-allotments in the sale of the Firm Notes by the Initial Purchaser. The
Option may be exercised once in whole or in part at any time not more than 30
days subsequent to the date of this Agreement upon notice in writing or by
facsimile by the Initial Purchaser to the Company setting forth the amount
(which shall be an integral multiple of $1,000) of Optional Notes as to which
the Initial Purchaser is exercising the Option.

     The date for the delivery of and payment for the Optional Notes, being
herein referred to as an "Optional Delivery Date," which may be the First
Delivery Date (the First Delivery Date and the Optional Delivery Date, if any,
being sometimes referred to as a "Delivery

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Date"), shall be determined by the Initial Purchaser but shall not be later
than five full business days after written notice of election to purchase
Optional Notes is given. Delivery of the Optional Notes shall be made to the
Initial Purchaser against payment of the purchase price by the Initial
Purchaser. Payment for the Optional Notes shall be effected either by wire
transfer of immediately available funds to an account with a bank in the City of
New York, the account number and the ABA number for such bank to be provided by
the Company to the Initial Purchaser at least two business days in advance of
the Optional Delivery Date, or by such other manner of payment as may be agreed
by the Company and the Initial Purchaser.

     (c) The Company will deliver against payment of the purchase price (a) the
Notes initially sold to qualified institutional buyers ("QIBs"), as defined in
Rule 144A under the Securities Act ("Rule 144A") in the form of one or more
permanent global certificates (the "Global Notes"), registered in the name of
Cede & Co., as nominee for The Depository Trust Company ("DTC") and (b) the
Notes initially sold to "non-U.S. persons" outside the United States in
compliance with Regulation S under the Securities Act, in the form of one or
more Global Notes, registered in the name of Cede & Co., as nominee for DTC.
Beneficial interests in the Notes initially sold to QIBs will be shown on, and
transfers thereof will be effected only through, records maintained in
book-entry form by DTC and its participants.

     The Global Notes will be made available, at the request of the Initial
Purchaser, for inspection at least 24 hours prior to such Delivery Date. The
Certificated Notes will be made available, at the request of the Initial
Purchaser, for checking at least 48 hours prior to such Delivery Date.

     (d) Time shall be of the essence, and delivery at the time and place
specified pursuant to this Agreement is a further condition of the obligations
of the Initial Purchaser hereunder.

     3. Further Agreements of the Company. The Company agrees with the Initial
Purchaser as follows:

     (a) To advise the Initial Purchaser promptly of any proposal to amend or
supplement the Offering Memorandum and not to effect any such amendment or
supplement without the consent of the Initial Purchaser. If, at any time prior
to completion of the resale of the Notes by the Initial Purchaser, any event
shall occur or condition exist as a result of which it is necessary to amend or
supplement the Offering Memorandum in order that the Offering Memorandum will
not include an untrue statement of a material fact or omit to state a material
fact necessary in order to make the statements therein, in the light of the
circumstances existing at the time it is delivered to a purchaser, not
misleading, to promptly notify the Initial Purchaser and prepare, subject to the
first sentence of this Section 3(a), such amendment or supplement as may be
necessary to correct such untrue statement or omission;

                                       11
<PAGE>

     (b) To furnish to the Initial Purchaser and to Latham & Watkins, counsel to
the Initial Purchaser, copies of the Offering Memorandum and the Offering
Memorandum (and all amendments and supplements thereto) in each case as soon as
available and in such quantities as the Initial Purchaser reasonably requests
for internal use and for distribution to prospective purchasers; and to furnish
to the Initial Purchaser on the date hereof four copies of the Offering
Memorandum signed by duly authorized officers of the Company, one of which will
include the independent auditors' reports therein manually signed by such
independent auditors. The Company will pay the expenses of printing and
distributing to the Initial Purchaser all such documents;

     (c) To use its reasonable efforts to take such action as the Initial
Purchaser may reasonably request from time to time, to qualify the Notes for
offering and sale under the securities laws of such jurisdictions as the Initial
Purchaser may request and to comply with such laws so as to permit the
continuance of sales and dealings therein in such jurisdictions in the United
States for as long as may be necessary to complete the resale of the Notes;
provided that in connection therewith, the Company shall not be required to
qualify as a foreign corporation or otherwise subject itself to taxation in any
jurisdiction in which it is not otherwise so qualified or subject;

     (d) To apply the proceeds from the sale of the Notes as set forth under
"Use of Proceeds" in the Offering Memorandum;

     (e) For a period of 90 days from the date of the Offering Memorandum, not
to, directly or indirectly, (1) offer for sale, sell, or otherwise dispose of
(or enter into any transaction or device which is designed to, or could be
expected to, result in the disposition by any person at any time in the future
of) any shares of Common Stock or securities convertible into or exchangeable or
exercisable for Common Stock (other than the Notes and shares issued pursuant to
currently outstanding options, warrants, rights or convertible securities), or
(2) enter into any swap or other derivatives transaction that transfers to
another, in whole or in part, any of the economic benefits or risks of ownership
of such shares of Common Stock, whether any such transaction described in clause
(1) or (2) above is to be settled by delivery of Common Stock or other
securities, in cash or otherwise, in each case without the prior written consent
of Lehman Brothers Inc.; and to cause the Lehman Partnership (as defined in the
Offering Memorandum), Mr. Frank C. Lanza and Mr. Robert V. LaPenta to furnish to
the Initial Purchaser, prior to the First Delivery Date, a "lock-up" letter or
letters, in the form affixed hereto and substance and form satisfactory to
counsel for the Initial Purchaser;

     (f) For so long as any of the Notes are "restricted securities" within the
meaning of Rule 144(a)(3) under the Securities Act, to provide to any holder of
the Notes or to any prospective purchaser of the Notes designated by any holder,
upon request of such holder or prospective purchaser, information required to be
provided by Rule 144A(d)(4) of the Securities Act if, at the time of such
request, the Company is not subject to the reporting requirements under Section
13 or 15(d) of the Exchange Act;

                                       12
<PAGE>

     (g) Each of the Notes will bear, to the extent applicable, the legend
contained in "Notice to Investors" in the Offering Memorandum for the time
period and upon the other terms stated therein, except after the Notes are
resold pursuant to a registration statement effective under the Securities Act;

     (h) To take such steps as shall be necessary to ensure that neither the
Company nor any subsidiary shall become an "investment company" within the
meaning of such term under the United States Investment Company Act of 1940, and
the rules and regulations of the Commission thereunder;

     (i) To execute and deliver the Registration Rights Agreement (in form and
substance satisfactory to the Initial Purchaser;

     (j) To use its best efforts to assist the Initial Purchaser in arranging to
cause the Notes to be accepted to trade in the PORTAL market ("PORTAL") of the
National Association of Securities Dealers, Inc. ("NASD");

     (k) To use its best efforts to cause the Notes to be accepted for clearance
and settlement through the facilities of DTC;

     (l) To use its best efforts to have the Conversion Shares approved by the
New York Stock Exchange ("NYSE") for inclusion prior to the effectiveness of the
Registration Statement;

     (m) Neither the Company, any of its affiliates nor any persons acting on
its or their behalf has engaged or will engage, during the Restricted Period (as
defined herein), in any directed selling efforts within the meaning of Rule
901(b) of Regulation S with respect to the Notes, and it, its affiliates, and
all persons acting on its behalf have complied and will comply with the offering
restrictions requirements of Regulation S.

     4. Expenses. The Company agrees to pay:

     (a) the costs incident to the authorization, issuance, sale and delivery of
the Notes, and any taxes payable in that connection;

     (b) the costs incident to the preparation, printing and distribution of the
Offering Memorandum and any amendment or supplement to the Offering Memorandum,
as provided in this Agreement;

     (c) the costs of delivering and distributing the Operative Documents;

     (d) the fees and expenses of Simpson Thacher & Bartlett and
PricewaterhouseCoopers, LLP;

                                       13
<PAGE>

     (e) the costs of distributing the terms of agreement relating to the
organization of the underwriting syndicate and selling group to the members
thereof by mail, telex or other means of communication;

     (f) the fees and expenses of qualifying the Notes under the securities laws
of the several jurisdictions as provided in Section 3(c) and of preparing,
printing and distributing a Blue Sky Memorandum (including reasonable related
fees and expenses of counsel to the Initial Purchaser);

     (g) all other costs and expenses incident to (i) the preparation of the
Company's "net road show" presentation materials and (ii) the road show
travelling expenses of the Company;

     (h) all fees and expenses incurred in connection with any rating of the
Notes;

     (i) the costs of preparing the Notes;

     (j) all expenses and fees in connection with the application for inclusion
of the Notes in the PORTAL market and the inclusion of the Conversion Shares on
the NYSE; and

     (k) all other costs and expenses incident to the performance of the
obligations of the Company and the Guarantors under this Agreement;

provided that, except as provided in this Section 4 and in Section 7, the
Initial Purchaser shall pay its own costs and expenses, including the costs and
expenses of its counsel and any transfer taxes on the Notes which it may sell.

     5. Conditions of the Initial Purchaser's Obligations. The several
obligations of the Initial Purchaser hereunder are subject to the accuracy, when
made and on each Delivery Date, of the representations and warranties of the
Company and the Guarantors contained herein, to the performance by the Company
and the Guarantors of its obligations hereunder, and to each of the following
additional terms and conditions:

     (a) The Initial Purchaser shall not have discovered and disclosed to the
Company prior to or on such Delivery Date that the Offering Memorandum or any
amendment or supplement thereto contains any untrue statement of a fact which,
in the opinion of Latham & Watkins, is material or omits to state any fact which
is material and necessary to make the statements therein, in the light of the
circumstances under which they were made, not misleading;

     (b) All corporate proceedings and other legal matters incident to the
authorization, form and validity of the Operative Documents and the Offering
Memorandum or

                                       14
<PAGE>

any amendment or supplement thereto, and all other legal matters relating to
the Operative Documents and the transactions contemplated thereby shall be
satisfactory in all material respects to counsel to the Initial Purchaser, and
the Company shall have furnished to such counsel all documents and information
that they may reasonably request to enable them to pass upon such matters;

     (c) Simpson Thacher & Bartlett shall have furnished to the Initial
Purchaser its written opinion, as counsel to the Company, addressed to the
Initial Purchaser and dated such Delivery Date, in form and substance reasonably
satisfactory to the Initial Purchaser, to the effect that:

          (i) The Company and each of the Delaware Guarantors have been duly
     organized and are validly existing as corporations in good standing under
     the laws of Delaware, and have all corporate power and authority necessary
     to conduct their respective businesses as described in the Offering
     Memorandum;

          (ii) All of the outstanding shares of Common Stock of the Company have
     been duly authorized, validly issued, fully paid and non-assessable; and
     all of the issued shares of capital stock of each Delaware Guarantor of the
     Company have been duly and validly authorized and issued, are fully paid
     and non-assessable (except for directors' qualifying shares) and, based
     solely on our examination of each such subsidiary's stock ledger and minute
     book, all such shares are held of record by the Company and/or a subsidiary
     of the Company;

          (iii) The Indenture has been duly authorized, executed and delivered
     by the Company and, assuming the Indenture is a valid and legally binding
     obligation of the Trustee, constitutes a valid and legally binding
     obligation of the Company enforceable against the Company in accordance
     with its terms, subject to the effects of bankruptcy, insolvency,
     fraudulent conveyance, reorganization, moratorium and other similar laws
     relating to or affecting creditors' rights generally, general equitable
     principles (whether considered in a proceeding in equity or at law) or an
     implied covenant of good faith and fair dealing;

          (iv) The Notes have been duly authorized, executed and issued by the
     Company and, assuming due authentication thereof by the Trustee and upon
     payment and delivery in accordance with the terms of the Purchase
     Agreement, will constitute valid and legally binding obligations of the
     Company enforceable against the Company in accordance with their terms and
     entitled to the benefits of the Indenture subject to the effects of
     bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium
     and other similar laws relating to or affecting creditors' rights
     generally, general equitable principles (whether considered in a proceeding
     in equity or at law) or an

                                       15
<PAGE>

     implied covenant of good faith and fair dealing; and the Notes, when issued
     and delivered, will conform to the description thereof contained in the
     Offering Memorandum;

          (v) The Conversion Shares that are authorized on the date hereof have
     been duly authorized and validly reserved for issuance upon conversion of
     the Notes; and the Conversion Shares, when so issued and delivered upon
     such conversion in accordance with the terms of the Indenture, will be duly
     and validly authorized and issued, fully paid and nonassessable;

          (vi) The Guarantees have been duly authorized, executed and issued by
     the Delaware Guarantors and, assuming due authentication of the Notes by
     the Trustee, upon payment and delivery in accordance with the terms of the
     Purchase Agreement will constitute valid and legally binding obligations of
     each of the Delaware Guarantors enforceable in accordance with their terms,
     subject to the effects of bankruptcy, insolvency, fraudulent conveyance,
     reorganization, moratorium and other similar laws relating to or affecting
     creditors' rights generally, general equitable principles (whether
     considered in a proceeding in equity or at law) or an implied covenant of
     good faith and fair dealing;

          (vii) Assuming that the Guarantees have been duly authorized and
     issued by each of the Non-Delaware Guarantors and, assuming due
     authentication of the Notes by the Trustee, upon payment and delivery of
     the Notes in accordance with the terms of the Purchase Agreement, the
     Guarantees will constitute valid and legally binding obligations of the
     Non-Delaware Guarantors enforceable against the Non-Delaware Guarantors.

          (viii) The statements contained in the Offering Memorandum under the
     captions "Risk Factors-The notes are subordinated to all our existing and
     future senior indebtedness, which may inhibit our ability to repay you,"
     "Risk Factors-The terms of our senior indebtedness could restrict our
     flexibility and limit our ability to satisfy obligations under the Notes,"
     "Risk Factors--Future sales of common stock of L-3 Holdings in public
     market could lower the stock price," "Risk Factors--Delaware Law and the
     charter documents of L-3 Holdings may impede or discourage a takeover,
     which could cause the market price of its shares to decline," "Certain
     Relationships and Related Transactions," "Description of Other
     Indebtedness," and "Description of the Notes," insofar as they describe
     charter documents, contracts, statutes, rules and regulations and other
     legal matters, constitute an accurate summary thereof in all material
     respects;

                                       16
<PAGE>

          (ix) The statements made in the Offering Memorandum under the caption
     "Certain United States Federal Tax Considerations," insofar as they purport
     to constitute summaries of matters of United States federal tax law and
     regulations or legal conclusions with respect thereto, constitute accurate
     summaries of the matters described therein in all material respects;

          (x) This Agreement has been duly authorized, executed and delivered by
     the Company and the Delaware Guarantors; and

          (xi) The Registration Rights Agreement has been duly authorized,
     executed and delivered by the Company and the Delaware Guarantors and,
     assuming that the Registration Rights Agreement is the valid and legally
     binding obligation of the Initial Purchaser and Non-Delaware Guarantors,
     constitutes a valid and legally binding obligation of the Company and the
     Guarantors, enforceable against the Company and the Guarantors in
     accordance with its terms.

          (xii) Except as specifically disclosed in the Offering Memorandum, the
     issue and sale of the Notes and Guarantees being delivered on such Delivery
     Date by the Company and the Guarantors and the compliance by the Company
     and the Guarantors, as applicable, with all of the provisions of this
     Agreement and the Indenture and the consummation of the transactions
     contemplated hereby and thereby will not breach or result in a default
     under, any indenture, mortgage, deed of trust, loan agreement or other
     agreement or instrument filed as an exhibit to a document incorporated by
     reference in the Offering Memorandum ("Exchange Act Documents") nor will
     such actions violate the Certificate of Incorporation or By-Laws or other
     organizational documents of the Company or the Delaware Guarantors, or any
     federal or New York statute, the Delaware Limited Liability Company Act or
     the Delaware General Corporation Law or any rule or regulation that has
     been issued pursuant to any federal or New York statute, the Delaware
     Limited Liability Company Act or the Delaware General Corporation Law or
     any order known to such counsel issued pursuant to any federal or New York
     statute, the Delaware Limited Liability Company Act or the Delaware General
     Corporation Law by any court or governmental agency or body or court having
     jurisdiction over the Company or any of its subsidiaries or any of their
     properties or assets; and no consent, approval, authorization, order,
     registration or qualification of or with any federal or New York
     governmental agency or body or any Delaware governmental agency or body
     acting pursuant to the Delaware Limited Liability Company Act or Delaware
     General Corporation Law or, to such counsel's knowledge, any federal or New
     York court or any Delaware court acting pursuant to the Delaware Limited
     Liability Company Act or the Delaware General Corporation Law is required
     for the issue and sale of the Notes by the

                                       17
<PAGE>

     Company (and the guarantees of such Notes by the Guarantors), except
     for such consents, approvals, authorizations, registrations or
     qualifications as may be required state securities or Blue Sky laws in
     connection with the purchase and distribution of the Notes and Guarantees
     by the Initial Purchaser. The opinions set forth in this paragraph are
     based upon our consideration of only those statutes, rules and regulations
     which, in such counsel's experience, are normally applicable to securities
     underwriting transactions.

          (xiii) No registration of the Notes under the Securities Act and no
     qualification of the Indenture under the Trust Indenture Act is required
     for the offer and sale of the Notes by the Company to the Initial Purchaser
     or the reoffer and resale of the Notes by the Initial Purchaser to the
     Initial Purchaser thereform solely in the manner contemplated by the
     Offering Memorandum, the Purchase Agreement and the Indenture.

     In rendering such opinion, such counsel may state that its opinion is
     limited to matters governed by the federal laws of the United States and
     the laws of the State of New York and the Delaware General Corporation Law.

     Such counsel shall also have furnished to the Initial Purchaser a
     written statement, addressed to the Initial Purchaser and dated the
     Delivery Date. Such counsel has not independently verified the accuracy,
     completeness or fairness of the statements made or included in the Offering
     Memorandum and take no responsibility therefor, except as and to the extent
     set forth in paragraphs (viii) and (ix) above. In the course of the
     preparation by the Company of the Offering Memorandum (excluding the
     Exchange Act Documents), such counsel participated in conferences with
     certain officers and employees of the Company, with representatives of
     PricewaterhouseCoopers, LLP and with counsel to the Company. Based upon
     such counsel's examination of the Offering Memorandum (including the
     Exchange Act Documents), such counsel's investigations made in connection
     with the preparation of the Offering Memorandum (excluding the Exchange Act
     Documents) and such counsel's participation in the conferences referred to
     above, such counsel has no reason to believe that the Offering Memorandum,
     including the Exchange Act Documents contains any untrue statement of a
     material fact or omits to state any material fact necessary in order to
     make the statements therein, in the light of the circumstances under which
     they were made, not misleading, except that in each case such counsel need
     not express belief with respect to the financial statements or other
     financial data contained in the Offering Memorandum or incorporated therein
     by reference.

     (d) Christopher C. Cambria, General Counsel of the Company, shall have
furnished to the Initial Purchaser his written opinion, as General Counsel to
the

                                       18
<PAGE>

Company, addressed to the Initial Purchaser and dated such Delivery Date, in
form and substance reasonably satisfactory to the Initial Purchaser, to the
effect that:

          (i) Other than as set forth in the Prospectus, there are no preemptive
     or other rights to subscribe for or to purchase, nor any restriction upon
     the voting or transfer of, any shares of the Stock pursuant to the
     Company's charter or by-laws or any agreement or other instrument known to
     such counsel;

          (ii) To such counsel's knowledge, the Company and each of its
     subsidiaries have good and marketable title to all property (real and
     personal) described in the Offering Memorandum as being owned by them, free
     and clear of all liens, claims, security interests or other encumbrances
     except such as are described in the Offering Memorandum or, to the extent
     that any such liens, claims, security interests or other encumbrances would
     not have a Material Adverse Effect (individually or in the aggregate) and
     all the material property described in the Offering Memorandum as being
     held under lease by the Company and its subsidiaries is held by them under
     valid, subsisting and enforceable leases, with only such exceptions as
     would not have a Material Adverse Effect (individually or in the
     aggregate);

          (iii) To such counsel's knowledge and except as otherwise disclosed in
     the Offering Memorandum, except (1) as described in the Offering
     Memorandum, (2) as provided in the Registration Rights Agreement, (3) in
     respect of the obligation to deliver freely "tradable shares" to the
     sellers in connection with the acquisition of the ILEX Systems, Inc.
     business and (4) other than the Registration Rights Agreement, dated
     December 11, 1998, among the L-3 Communications Corporation and the parties
     named therein; there are no contracts, agreements or understandings between
     the Company and any person granting such person the right to require the
     Company to include such person's securities in the securities registered
     pursuant to Registration Statement;

          (iv) To such counsel's knowledge and except as otherwise disclosed in
     the Offering Memorandum, there are no legal or governmental proceedings
     pending or threatened, against the Company or any of its subsidiaries or to
     which the Company or any of its subsidiaries is a party or of which any
     property or assets of the Company or any of its subsidiaries is the subject
     which, if determined adversely to the Company or any of its subsidiaries,
     are reasonably likely to cause a Material Adverse Effect; and

          (v) None of the issue and sale of the Notes and Guarantees being
     delivered on such Delivery Date by the Company and the Guarantors and the

                                       19
<PAGE>

     compliance by the Company and the Guarantors, as applicable, with all
     of the provisions of this Agreement and the consummation of the
     transactions contemplated hereby requires any consent, approval,
     authorization or other order of, or registration or filing with, any
     federal court, federal regulatory body, federal administrative agency or
     other federal governmental official having authority over government
     procurement matters (provided, that the opinion contained in this paragraph
     (v) may be delivered by other counsel reasonably satisfactory to the
     Initial Purchaser).

     (e) The Initial Purchaser shall have received from Latham & Watkins,
counsel for the Initial Purchaser, such opinion or opinions, dated the Delivery
Date, with respect to the issuance and sale of the Notes and Guarantees, the
Offering Memorandum and other related matters as the Initial Purchaser may
reasonably require, and the Company shall have furnished to such counsel such
documents as they reasonably request for the purpose of enabling them to pass
upon such matters;

     (f) At the time of the First Delivery Date, the Initial Purchaser shall
have received from PricewaterhouseCoopers, LLP a letter, in form and substance
satisfactory to the Initial Purchaser, addressed to the Initial Purchaser and
dated the date hereof (i) confirming that they are independent public
accountants within the meaning of the Securities Act and under Rule 101 of
AICPA's Code of Professional Conduct and are in compliance with the applicable
requirements relating to the qualification of accountants under Rule 2-01 of
Regulation S-X of the Commission, (ii) stating, as of the date hereof (or, with
respect to matters involving changes or developments since the respective dates
as of which specified financial information is given in the Offering Memorandum,
as of a date not more than five days prior to the date hereof), the conclusions
and findings of such firm with respect to the financial information and other
matters ordinarily covered by accountants' "comfort letters" to underwriters in
connection with registered public offerings;

     (g) With respect to the letter of PricewaterhouseCoopers, LLP referred to
in the preceding paragraph and delivered to the Initial Purchaser (the "initial
letter"), on any subsequent Optional Delivery Date, the Company shall have
furnished to the Initial Purchaser a letter (the "bring-down letter") of such
accountants, addressed to the Initial Purchaser and dated such Delivery Date (i)
confirming that they are independent public accountants within the meaning of
the Securities Act and Code of Professional Conduct are in compliance with the
applicable requirements relating to the qualification of accountants under Rule
2-01 of Regulation S-X of the Commission, (ii) stating, as of the date of the
bring-down letter (or, with respect to matters involving changes or developments
since the respective dates as of which specified financial information is given
in the Offering Memorandum, as of a date not more than five days prior to the
date of the bring-down letter), the conclusions and findings of such firm with
respect to the financial information and other matters covered by the initial
letter and (iii) confirming in all material respects the conclusions and
findings set forth in the initial letter;

     (h) The Company shall have furnished to the Initial Purchaser a
certificate, dated such Delivery Date and delivered on behalf of the Company, of
its Chairman of the Board,

                                       20

<PAGE>

its President or a Vice President and its chief financial officer, in form and
substance satisfactory to the Initial Purchaser, to the effect that:

          (i) The representations, warranties and agreements of the Company in
     Section 1 are true and correct as of the date given and as of such Delivery
     Date; and the Company has complied with all its agreements contained herein
     to be performed prior to or on such Delivery Date; and

          (ii) Such officer has carefully examined the Offering Memorandum and,
     in such officer's opinion (A) the Offering Memorandum, as of its date, did
     not include any untrue statement of a material fact and did not omit to
     state any material fact necessary to make the statements therein, in the
     light of the circumstances under which they were made, not misleading, and
     (B) since the date of the Offering Memorandum, no event has occurred which
     should have been set forth in a supplement or amendment to the Offering
     Memorandum.

     (i) Subsequent to the execution and delivery of this Agreement (i) no
downgrading shall have occurred in the rating accorded the Company's debt
securities by any "nationally recognized statistical rating organization," as
that term is defined by the Commission for purposes of Rule 436(g)(2) of the
Rules and Regulations and (ii) no such organization shall have publicly
announced that it has under surveillance or review, with possible negative
implications, its rating of any of the Company's debt securities;

     (j) The Indenture shall have been duly executed and delivered by the
Company and the Trustee and the Notes shall have been duly executed and
delivered by the Company and duly authenticated by the Trustee;

     (k) The Company and the Initial Purchaser shall have executed and delivered
the Registration Rights Agreement (in form and substance satisfactory to the
Initial Purchaser) and the Registration Rights Agreement shall be in full force
and effect;

     (l) The NASD shall have accepted the Notes for trading on PORTAL;

     (m)(i) Neither the Company nor any of its subsidiaries shall have sustained
since the date of the latest audited financial statements included in the
Offering Memorandum any loss or interference with its business from fire,
explosion, flood or other calamity, whether or not covered by insurance, or from
any labor dispute or court or governmental action, order or decree, except (A)
as set forth or contemplated in the Offering Memorandum and (B) for operating
losses incurred in the ordinary course of business, or (ii) since such date
there shall not have been any change in the capital stock or long-term debt of
the Company and its subsidiaries (except for issuances of shares of Common Stock
upon exercise of outstanding options described in the Offering Memorandum or
pursuant to Authorized Grants), or any change, or any development involving a
prospective change, in or affecting the general affairs, management, financial

                                       21
<PAGE>

position, stockholders' equity or results of operations of the Company and its
subsidiaries, except as set forth or contemplated in the Offering Memorandum,
the effect of which, in any such case described in clause (i) or (ii), is, in
the reasonable judgment of the Initial Purchaser, so material and adverse as to
make it impracticable or inadvisable to proceed with the sale or the delivery of
the Notes being delivered on such Delivery Date on the terms and in the manner
contemplated in the Offering Memorandum;

     (n) Subsequent to the execution and delivery of this Agreement there shall
not have occurred any of the following:

          (i) trading in securities generally on the NYSE, the American Stock
     Exchange, the NASDAQ or the over-the-counter market, or trading in any
     securities of the Company on any exchange shall have been suspended or
     minimum prices shall have been established on any such exchange or market
     by the Commission, by such exchange or by any other regulatory body or
     governmental authority having jurisdiction;

          (ii) a banking moratorium shall have been declared by United States
     federal or New York State authorities;

          (iii) the United States shall have become engaged in hostilities,
     there shall have been an escalation in hostilities involving the United
     States, or there shall have been a declaration of a national emergency or
     war by the United States; or

          (iv) there shall have occurred such a material adverse change in
     general economic, political or financial conditions (or the effect of
     international conditions on the financial markets in the United States
     shall be such) as to make it, in the sole judgment of the Initial
     Purchaser, impracticable or inadvisable to proceed with the offering or
     delivery of the Notes being delivered on such Delivery Date on the terms
     and in the manner contemplated in the Offering Memorandum.

     All opinions, letters, evidence and certificates mentioned above or
elsewhere in this Agreement shall be deemed to be in compliance with the
provisions hereof only if they are in form and substance satisfactory to counsel
to the Initial Purchaser.

     6. Representations, Warranties and Agreements of the Initial Purchaser. The
Initial Purchaser represents and warrants that it is a QIB and is not acquiring
the Notes with a view to any distribution thereof or with any present intention
of offering or selling any of the Notes in a transaction that would violate the
Securities Act or the securites laws of any State of the United States or any
applicable jurisdiction. In connection with the sale of the Notes by the

                                       22
<PAGE>

Initial Purchaser, the Initial Purchaser will solicit offers to buy the Notes
only from, and will offer to sell the Notes only to, the Eligible Purchasers
(defined as: (i) persons whom the Initial Purchaser reasonably believes are
"qualified institutional buyers" as defined in Rule 144A under the Securities
Act and (ii) outside the United States to persons other than U.S. persons in
offshore transactions meeting the requirements of Rule 904 of Regulation S under
the Securities Act) in accordance with this Agreement and on the terms
contemplated by the Offering Memorandum. The Initial Purchaser agrees with the
Company that:

     (a) The Notes and the Conversion Shares have not been and will not be
registered under the Securities Act in connection with the initial offering of
the Notes;

     (b) The Initial Purchaser is purchasing the Notes pursuant to a private
sale exemption from registration under the Securities Act;

     (c) The Notes have not been and will not be offered or sold by the Initial
Purchaser or its affiliates acting on its behalf within the United States or to,
or for the account or benefit of, United States persons except in accordance
with Rule 144A;

     (d) The Initial Purchaser will not offer or sell the Notes in the United
States by means of any form of general solicitation or general advertising
within the meaning of Rule 502(c) of Regulation D, including (i) any
advertisement, article, notice or other communication published in any
newspaper, magazine or similar medium or broadcast over television or radio, or
(ii) any seminar or meeting whose attendees have been invited by any general
solicitation or general advertising in the United States; and

     (e) The Notes have not been and will not be registered under the Securities
Act and may not be offered or sold within the United States or to, or for the
account or benefit of, U.S. persons except in accordance with an exemption from
the registration requirements of the Securities Act. The Initial Purchaser
represents that it has been offered, sold or delivered the Notes, and will not
offer, sell or deliver the Notes (i) as a part of its distribution at any time
or (ii) otherwise until one year after the later of the commencement of the
Offering of the Notes and the Closing Date (such period, the "Restricted
Period"), within the United States or to, or for the account or benefit of U.S.
Persons except in accordance with Rule 144A under the Securities Act.
Accordingly, the Initial Purchaser represents and agrees that neither it, its
affiliates nor any persons acting on its or their behalf has engaged or will
engage, during the Restricted Period, in any directed selling efforts within the
meaning of Rule 901(b) of Regulation S with respect to the Notes, and it, its
affiliates and all persons acting on its behalf have complied and will comply
with the offering restrictions requirements of Regulation S.

     (f) The Initial Purchaser agrees that, at or prior to confirmation of a
sale of Notes (other than a sale pursuant to Rule 144A in transactions that are
exempt from the registration requirements of the Securities Act), it will have
sent to each distributor, dealer or

                                       23
<PAGE>

person receiving a selling concession, fee or other renumeration that purchases
Notes form it during the Restricted Period a confirmation or notice
substantially to the following effect:

     "The Notes covered hereby have not been registered under the U.S.
     Securities Act of 1933 (the "Securities Act") and may not be offered and
     sold within the United States or to, or for the account or benefit of U.S.
     persons (i) as part of their distribution at any time or (ii) otherwise
     until one year after the later of the commencement of the offering or the
     closing date, except in either case in accordance with Regulation S (or
     Rule 144A if available) under the Securities Act. Terms used above have the
     meanings assigned to them in Regulation S."

     Such Initial Purchaser further agrees that it has not entered and will not
enter into any contractual arrangement with respect to the distribution or
delivery of the Notes, except with its affiliates or with the prior written
consent of the Company.

     (g) The Initial Purchaser further represents and agrees that (i) it has not
offered or sold and will not offer or sell any Notes to persons in the United
Kingdom prior to the expiry of the period of six months from the issue date of
the Notes, except to persons whose ordinary activities involve them in
acquiring, holding, managing or disposing of investments (s principal or agent)
for the purpose of their businesses or otherwise in circumstances that have not
resulted and will not result in an offer to the public in the United Kingdom
within the meaning of the Public Offers of Securities regulations 1995, (ii) it
has complied with and will comply with all applicable provisions of the
Financial Services Act 1986 with respect to anything done by it in relation to
the Notes in, from or otherwise involving the United Kingdom), and (iii) it has
only issued or passed on and will only issue or pass on in the United Kingdom
any documents received by it in connection with the issuance of the Notes to a
person who is of a kind described in Article 11(3) of the Financial Services Act
1986 (Investment Advertisements) (Exemptions) Order 1995 or is a person to whom
the document may otherwise be lawfully issued or passed on.

     (h) The Initial Purchaser agrees not to cause any advertisement of the
Notes to be published in any newspaper or periodical or posted in any public
place and not to issue any circular relating to the Notes, except such
advertisements as include the statements required by Regulation S.

     (i) The sales of the Notes pursuant to Regulation S are "offshore
transactions" and are not part of a plan or scheme to evade the registration
provisions of the Securities Act.

     (j) The Initial Purchaser understands that the Company and, for purposes of
the opinions to be delivered to you pursuant to Section 5 hereof, counsel to the
Company, General Counsel to the Company and counsel to the Initial Purchaser,
will rely upon the accuracy and truth of the foregoing representations and the
Initial Purchaser hereby consent to such reliance.

                                       24
<PAGE>

     The terms used in this Section 7 that have meanings assigned to them in
Regulation S are used herein as so defined.

     The Initial Purchaser further agrees that, in connection with the sale of
the Notes by the Initial Purchaser, it will solicit offers to buy the Notes only
from, and will offer to sell the Notes only to Eligible Purchasers.

     7. Indemnification and Contribution.

     (a) The Company and the Guarantors shall jointly and severally indemnify
and hold harmless the Initial Purchaser, its officers and employees and each
person, if any, who controls the Initial Purchaser within the meaning of the
Securities Act, from and against any loss, claim, damage or liability, joint or
several, or any action in respect thereof (including, but not limited to, any
loss, claim, damage, liability or action relating to purchases and sales of
Notes), to which the Initial Purchaser, officer, employee or controlling person
may become subject, under the Securities Act or otherwise, insofar as such loss,
claim, damage, liability or action arises out of, or is based upon, (i) any
untrue statement or alleged untrue statement of a material fact contained in the
Offering Memorandum or in any amendment or supplement thereto, (ii) the omission
or alleged omission to state in the Offering Memorandum, or in any amendment or
supplement thereto, or in any Blue Sky Application any material fact required to
be stated therein or necessary to make the statements therein not misleading or
(iii) any act or failure to act or any alleged act or failure to act by the
Initial Purchaser in connection with, or relating in any manner to, the Notes or
the offering contemplated hereby, and which is included as part of or referred
to in any loss, claim, damage, liability or action arising out of or based upon
matters covered by clause (i) or (ii) above (provided that the Company and the
Guarantors shall not be liable under this clause (iii) to the extent that it is
determined in a final judgment by a court of competent jurisdiction that such
loss, claim, damage, liability or action resulted directly from any such acts or
failures to act undertaken or omitted to be taken by the Initial Purchaser
through its gross negligence or willful misconduct), and shall reimburse the
Initial Purchaser and each such officer, employee or controlling person promptly
upon demand for any legal or other expenses reasonably incurred by the Initial
Purchaser, officer, employee or controlling person in connection with
investigating or defending or preparing to defend against any such loss, claim,
damage, liability or action as such expenses are incurred; provided, however,
that the Company and the Guarantors shall not be liable in any such case to the
extent that any such loss, claim, damage, liability or action arises out of, or
is based upon, any untrue statement or alleged untrue statement or omission or
alleged omission made in the Offering Memorandum, or in any such amendment or
supplement, in reliance upon and in conformity with written information
concerning the Initial Purchaser furnished to the Company by the Initial
Purchaser specifically for inclusion therein, which information consists solely
of the information. The foregoing indemnity agreement is in addition to any
liability which the Company or the Significant Subsidiary may otherwise have to
any Initial Purchaser or to the officer, employee or controlling person of the
Initial Purchaser.

     (b) The Initial Purchaser shall indemnify and hold harmless the Company,
the Guarantors, their officers and employees and the Guarantors, each of their
directors and each person,

                                       25
<PAGE>

if any, who controls the Company and the Guarantors within the meaning of the
Securities Act, from and against any loss, claim, damage or liability, joint or
several, or any action in respect thereof, to which the Company or any such
director, officer or controlling person, the Guarantors, may become subject,
under the Securities Act or otherwise, insofar as such loss, claim, damage,
liability or action arises out of, or is based upon, (i) any untrue statement or
alleged untrue statement of a material fact contained (A) in the Offering
Memorandum or in any amendment or supplement thereto, or (B) in any Blue Sky
Application or (ii) the omission or alleged omission to state in the Offering
Memorandum, or in any amendment or supplement thereto, or in any Blue Sky
Application any material fact required to be stated therein or necessary to make
the statements therein not misleading, but in each case only to the extent that
the untrue statement or alleged untrue statement or omission or alleged omission
was made in reliance upon and in conformity with written information concerning
such Initial Purchaser furnished to the Company by the Initial Purchaser
specifically for inclusion therein, and shall reimburse the Company and any such
director, officer or controlling person of the Company for any legal or other
expenses reasonably incurred by the Company, such Guarantor or any such
director, officer or controlling person of the Company in connection with
investigating or defending or preparing to defend against any such loss, claim,
damage, liability or action as such expenses are incurred. The foregoing
indemnity agreement is in addition to any liability which the Initial Purchaser
may otherwise have to the Company, the Guarantors or any such director, officer,
employee, or controlling person of the Company.

     (c) Promptly after receipt by an indemnified party under this Section 7 of
notice of any claim or the commencement of any action, the indemnified party
shall, if a claim in respect thereof is to be made against the indemnifying
party under this Section 7, notify the indemnifying party in writing of the
claim or the commencement of that action; provided, however, that the failure to
notify the indemnifying party shall not relieve it from any liability which it
may have under this Section 7 except to the extent it has been materially
prejudiced by such failure and, provided further, that the failure to notify the
indemnifying party shall not relieve it from any liability which it may have to
an indemnified party otherwise than under this Section 7. If any such claim or
action shall be brought against an indemnified party, and it shall notify the
indemnifying party thereof, the indemnifying party shall be entitled to
participate therein and, to the extent that it wishes, jointly with any other
similarly notified indemnifying party, to assume the defense thereof with
counsel reasonably satisfactory to the indemnified party. After notice from the
indemnifying party to the indemnified party of its election to assume the
defense of such claim or action, the indemnifying party shall not be liable to
the indemnified party under this Section 7 for any legal or other expenses
subsequently incurred by the indemnified party in connection with the defense
thereof other than reasonable costs of investigation; provided, however, any
indemnified party shall have the right to employ separate counsel in any such
action and to participate in the defense thereof but the fees and expenses of
such counsel shall be at the expense of the indemnified party unless (i) the
employment thereof has been specifically authorized by the indemnifying party in
writing, (ii) such indemnified party shall have been advised by such counsel
that there may be one or more legal defenses available to it which are different
from or additional to those available to the indemnifying party and in the
reasonable judgment of such counsel, it is advisable for such indemnified party
to employ separate counsel or (iii) the indemnifying party has failed to assume
the defense of such action and employ counsel reasonably satisfactory to the
indemnified party, in which case, if such indemnified party

                                       26
<PAGE>

notifies the indemnifying party in writing that it elects to employ separate
counsel at the expense of the indemnifying party, the indemnifying party shall
not, in connection with any one such action or separate but substantially
similar or related actions in the same jurisdiction arising out of the same
general allegations or circumstances, be liable for the reasonable fees and
expenses of more than one separate firm of attorneys (in addition to one local
counsel) at any time for all such indemnified parties, which firm shall be
designated in writing by Lehman Brothers Inc., if the indemnified parties under
this Section 7 consist of the Initial Purchaser or any of its respective
officers, employees or controlling persons, or by the Company, if the
indemnified parties under this Section 7 consist of the Company, the Guarantors
or any of the Company's or the Guarantors' directors, officers, employees or
controlling persons. No indemnifying party shall (i) without the prior written
consent of the indemnified parties (which consent shall not be unreasonably
withheld), settle or compromise or consent to the entry of any judgment with
respect to any pending or threatened claim, action, suit or proceeding in
respect of which indemnification or contribution may be sought hereunder
(whether or not the indemnified parties are actual or potential parties to such
claim or action) unless such settlement, compromise or consent includes an
unconditional release of each indemnified party from all liability arising out
of such claim, action, suit or proceeding, or (ii) be liable for any settlement
of any such action effected without its written consent (which consent shall not
be unreasonably withheld), but if settled with the consent of the indemnifying
party or if there be a final judgment of the plaintiff in any such action, the
indemnifying party agrees to indemnify and hold harmless any indemnified party
from and against any loss or liability by reason of such settlement or judgment.

     (d) If the indemnification provided for in this Section 7 shall for any
reason be unavailable to or insufficient to hold harmless an indemnified party
under Section 7(a) or 7(b) in respect of any loss, claim, damage or liability,
or any action in respect thereof, referred to therein, then each indemnifying
party shall, in lieu of indemnifying such indemnified party, contribute to the
amount paid or payable by such indemnified party as a result of such loss,
claim, damage or liability, or action in respect thereof, (i) in such proportion
as shall be appropriate to reflect the relative benefits received by the Company
and the Guarantors on the one hand and the Initial Purchaser on the other from
the offering of the Notes and Guarantees or (ii) if the allocation provided by
clause (i) above is not permitted by applicable law, in such proportion as is
appropriate to reflect not only the relative benefits referred to in clause (i)
above but also the relative fault of the Company and the Guarantors, on the one
hand and the Initial Purchaser on the other with respect to the statements or
omissions which resulted in such loss, claim, damage or liability, or action in
respect thereof, as well as any other relevant equitable considerations. The
relative benefits received by the Company and the Guarantors, on the one hand
and the Initial Purchaser on the other with respect to such offering shall be
deemed to be in the same proportion as the total net proceeds from the offering
of the Notes purchased under this Agreement (before deducting expenses) received
by the Company and the Guarantors, on the one hand, and the total underwriting
discounts and commissions received by the Initial Purchaser with respect to the
shares of the Notes and Guarantees purchased under this Agreement, on the other
hand, bear to the total gross proceeds from the offering of the Notes under this
Agreement, in each case as set forth in the table on the cover page of the
Offering Memorandum. The relative fault shall be determined by reference to
whether the untrue or alleged untrue statement of a material fact or omission or
alleged omission to state a material fact relates to information supplied by the
Company, and the Guarantors or the Initial Purchaser, the intent of the parties
and

                                       27
<PAGE>

their relative knowledge, access to information and opportunity to correct or
prevent such statement or omission. The Company, the Guarantors and the Initial
Purchaser agree that it would not be just and equitable if contributions
pursuant to this Section 7 were to be determined by pro rata allocation or by
any other method of allocation which does not take into account the equitable
considerations referred to herein. The amount paid or payable by an indemnified
party as a result of the loss, claim, damage or liability, or action in respect
thereof, referred to above in this Section 7 shall be deemed to include, for
purposes of this Section 7(d), any legal or other expenses reasonably incurred
by such indemnified party in connection with investigating or defending any such
action or claim. Notwithstanding the provisions of this Section 7(d), the
Initial Purchaser shall not be required to contribute any amount in excess of
the amount by which the total price at which the Notes purchased by it exceeds
the amount of any damages which the Initial Purchaser has otherwise paid or
become liable to pay by reason of any untrue or alleged untrue statement or
omission or alleged omission. No person guilty of fraudulent misrepresentation
(within the meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation. The Initial Purchaser's obligations to contribute as provided
in this Section 7(d) are several in proportion to their respective underwriting
obligations and not joint.

     (e) The Initial Purchaser confirms and the Company and the Guarantors
acknowledge that the statements with respect to the offering of the Notes by the
Initial Purchaser and the third, sixth, seventh, eighth, ninth, twelfth,
fourteenth, fifteenth, sixteenth and eighteenth third paragraphs under the
caption "Plan of Distribution" in the Offering Memorandum are correct and
constitute the only information concerning the Initial Purchaser furnished in
writing to the Company by or on behalf of the Initial Purchaser specifically for
inclusion in the Offering Memorandum.

     Nothing contained herein shall relieve the Initial Purchaser of any
liability it may have to the Company for damages caused by its default. If other
purchasers are obligated or agree to purchase the Notes of a defaulting or
withdrawing Initial Purchaser, either the remaining non-defaulting Initial
Purchaser or the Company may postpone the Delivery Date for up to seven full
business days in order to effect any changes in the Offering Memorandum or in
any other document or arrangement that, in the opinion of counsel to the Company
or counsel to the Initial Purchaser, may be necessary.

     8. Termination. The obligations of the Initial Purchaser hereunder may be
terminated by the Initial Purchaser by notice given to and received by the
Company prior to delivery of and payment for the Notes if, prior to that time,
any of the events described in Sections 5(k) and (l) shall have occurred or if
the Initial Purchaser shall decline to purchase the Notes for any reason
permitted under this Agreement.

     9. Reimbursement of Initial Purchaser's Expenses. If the Company and the
Guarantors shall fail to tender the Notes and the Guarantees for delivery to the
Initial Purchaser by reason of any failure, refusal or inability on the part of
the Company and the Guarantors to perform any agreement on its part to be
performed, or because any other condition of the Initial Purchaser's obligations
hereunder required to be fulfilled by the Company and the Guarantors is

                                       28
<PAGE>

not fulfilled, the Company and the Guarantors will reimburse the Initial
Purchaser for all out-of-pocket expenses (including fees and disbursements of
counsel) incurred by the Initial Purchaser in connection with this Agreement and
the proposed purchase of the Notes and the Guarantees, and upon demand the
Company and the Guarantors shall pay the full amount thereof to Lehman Brothers
Inc.

     10. Notices, etc. All statements, requests, notices and agreements
hereunder shall be in writing, and:

     (a) if to the Initial Purchaser, shall be delivered or sent by mail, telex
or facsimile transmission to Lehman Brothers Inc., Three World Financial Center,
New York, New York 10285, Attention: Syndicate Department (Fax: 212-528-8822),
with a copy, in the case of any notice pursuant to Section 10(d), to the
Director of Litigation, Office of the General Counsel, Lehman Brothers Inc.,
Three World Financial Center, 10th Floor, New York, NY 10285; and

     (b) if to the Company or to the Gurantors, shall be delivered or sent by
mail, telex or facsimile transmission to L-3 Communications, 600 Third Avenue,
34th Floor, New York, NY 10016, Attention: Christopher C. Cambria (Fax:
212-805-5494). Any such statements, requests, notices or agreements shall take
effect at the time of receipt thereof. The Company shall be entitled to act and
rely upon any request, consent, notice or agreement given or made by Lehman
Brothers Inc.

     11. Persons Entitled to Benefit of Agreement. This Agreement shall inure to
the benefit of and be binding upon the Initial Purchaser, the Company, the
Guarantors and their respective successors. This Agreement and the terms and
provisions hereof are for the sole benefit of only those persons, except that
(A) the representations, warranties, indemnities and agreements of the Company
and the Guarantors contained in this Agreement shall also be deemed to be for
the benefit of the officers and employees of the Initial Purchaser and the
person or persons, if any, who control the Initial Purchaser within the meaning
of Section 15 of the Securities Act and (B) any indemnity agreement of the
Initial Purchaser contained in Section 7(b) of this Agreement shall be deemed to
be for the benefit of directors and officers of the Company and any person
controlling the Company within the meaning of Section 15 of the Securities Act.
Nothing contained in this Agreement is intended or shall be construed to give
any person, other than the persons referred to in this Section 11, any legal or
equitable right, remedy or claim under or in respect of this Agreement or any
provision contained herein.

     12. Survival. The respective indemnities, representations, warranties and
agreements of the Company, the Guarantors and the Initial Purchaser contained in
this Agreement or made by or on behalf of them, respectively, pursuant to this
Agreement, shall survive the delivery of and payment for the Notes and shall
remain in full force and effect, regardless of any termination or cancellation
of this Agreement or any investigation made by or on behalf of any of them or
any person controlling any of them.

                                       29
<PAGE>

     13. Definition of the Terms "Business Day" and "Subsidiary." For purposes
of this Agreement, (a) "business day" means each Monday, Tuesday, Wednesday,
Thursday or Friday which is not a day on which banking institutions in New York
are generally authorized or obligated by law or executive order to close and (b)
"subsidiary" has the meaning set forth in Rule 405 of the Securities Act Rules
and Regulations.

     14. Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

     15. Counterparts. This Agreement may be executed in one or more
counterparts and, if executed in more than one counterpart, the executed
counterparts shall each be deemed to be an original but all such counterparts
shall together constitute one and the same instrument.

     16. Headings. The headings herein are inserted for convenience of reference
only and are not intended to be part of, or to affect the meaning or
interpretation of, this Agreement.

                            [Signature pages follow]

<PAGE>

     If the foregoing correctly sets forth the agreement among the Company, the
Guarantors and the Initial Purchaser, please indicate your acceptance in the
space provided for that purpose below.

                                      Very truly yours,

                                      L-3 COMMUNICATIONS HOLDINGS, INC.
                                            as the Company

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title: Vice President

                                      L-3 COMMUNICATIONS CORPORATION,
                                            as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title: Vice President

                                      HYGIENETICS ENVIRONMENTAL SERVICES, INC.,
                                            as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title: Vice President

                                      L-3 COMMUNICATIONS ILEX SYSTEMS, INC.,
                                             as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title: Vice President

<PAGE>

                                      L-3 COMMUNICATIONS AYDIN CORPORATION,
                                            as a Guarantor
                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title: Vice President

                                      MPRI, INC.,
                                           as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title: Vice President

                                      L-3 COMMUNICATIONS SPD TECHNOLOGIES, INC.,
                                            as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title:  Vice President

                                      SPD HOLDINGS, INC.,
                                            as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title:  Vice President

<PAGE>

                                      SPD ELECTRICAL SYSTEMS, INC.,
                                            as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title:  Vice President

                                      SPD SWITCHGEAR, INC.,
                                            as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title:  Vice President

                                      PAC ORD, INC.,
                                            as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title:  Vice President

                                      HENSCHEL, INC.,
                                            as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title:  Vice President

<PAGE>

                                      POWER PARAGON, INC.,
                                             as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title:  Vice President

                                      L-3 COMMUNICATIONS ESSCO, INC.,
                                            as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          ------------------------------
                                          Name: Christopher C. Cambria
                                          Title:   Vice President

                                      SOUTHERN CALIFORNIA MICROWAVE, INC.,
                                            as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title: Vice President

                                      L-3 COMMUNICATIONS STORM CONTROL SYSTEMS,
                                            INC.,
                                            as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title:  Vice President

<PAGE>

                                      L-3 COMMUNICATIONS DBS MICROWAVE, INC.,
                                             as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title:  Vice President

                                      MICRODYNE CORPORATION,
                                            as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title:  Vice President

                                      ELECTRODYNAMICS, INC.,
                                           as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title:  Vice President

                                      INTERSTATE ELECTRONICS CORPORATION,
                                           as a Guarantor

                                      By: /s/ Christopher C. Cambria
                                          -----------------------------
                                          Name: Christopher C. Cambria
                                          Title:  Vice President

<PAGE>

     If the foregoing correctly sets forth the agreement among the
Company, the Guarantors and the Initial Purchaser, please indicate your
acceptance in the space provided for that purpose below.

Accepted and agreed by:

LEHMAN BROTHERS INC.

By: /s/ David J. Brand
    ---------------------
    Name: David J. Brand
    Title: Managing Director
<PAGE>

                                   SCHEDULE 1

                                                     Principal Amount
Initial Purchaser                                     of Firm Notes
-----------------                                    ----------------

Lehman Brothers Inc. ...............................   $250,000,000

<PAGE>

                        FORM OF LOCK-UP LETTER AGREEMENT

LEHMAN BROTHERS INC.
Three World Financial Center
New York, NY  10285

Dear Sirs:

         The undersigned understands that you propose to enter into a purchase
agreement (the "Purchase Agreement") providing for the purchase by you the
"Initial Purchaser" of 5 1/4% Convertible Senior Subordinated Notes due 2009
(the "Notes"), convertible into shares of Common Stock, par value $.01 per share
(the "Common Stock"), of L-3 Communications Holdings, Inc. (the "Company") and
that the Initial Purchaser proposes to reoffer the Notes (the "Offering") in
reliance on an exemption from registration under the Securities Act of 1933.

         In consideration of the execution of the Purchase Agreement by the
Initial Purchaser, and for other good and valuable consideration, the
undersigned hereby irrevocably agrees that, without the prior written consent of
Lehman Brothers Inc., the undersigned will not, directly or indirectly, (1)
offer for sale, sell, or otherwise dispose of (or enter into any transaction or
device that is designed to, or could be expected to, result in the disposition
by any person at any time in the future of) any shares of Common Stock
(including, without limitation, shares of Common Stock that may be deemed to be
beneficially owned by the undersigned in accordance with the rules and
regulations of the Securities and Exchange Commission and shares of Common Stock
that may be issued upon exercise of any option or warrant) or securities
convertible into or exchangeable or exercisable for Common Stock owned by the
undersigned on the date of execution of this Lock-Up Letter Agreement or on the
date of the completion of the Offering, or (2) enter into any swap or other
derivatives transaction that transfers to another, in whole or in part, any of
the economic benefits or risks of ownership of such shares of Common Stock,
whether any such transaction described in clause (1) or (2) above is to be
settled by delivery of Common Stock or other securities, in cash or otherwise,
for a period of 90 days after the date of the final Offering Memorandum relating
to the Offering except in each case for transactions by any person other than
the Company relating to shares of Common Stock or other securities convertible
into or exchangeable or exercisable for Common Stock acquired in open market
transactions after the completion of the Offering.

         In furtherance of the foregoing, the Company and its Transfer Agent are
hereby authorized to decline to make any transfer of securities if such transfer
would constitute a violation or breach of this Lock-Up Letter Agreement.

         It is understood that, if the Company notifies you that it does not
intend to proceed with the Offering, if the Purchase Agreement does not become
effective, or if the Purchase Agreement (other than the provisions thereof which
survive termination) shall terminate or be terminated prior to payment for and
delivery of the Notes, we will be released from our obligations under this
Lock-Up Letter Agreement.

         It is further understood that the Company and the Initial Purchaser
have represented to the undersigned that certain officers and directors of the
Company shall be required to execute a Lock-Up Letter Agreement the terms of
which are identical to those contained herein. The Initial

<PAGE>

Purchaser and/or the Company will immediately notify the undersigned if any such
Lock-Up Letter Agreement is modified, amended, waived or terminated in a manner
so as to impose less stringent restrictions upon the person to which such
Lock-Up Letter Agreement applies as well as the nature of any such modification,
amendment, waiver or termination and this Lock-Up Letter Agreement shall be
deemed to have been modified, amended, waived or terminated in the same manner
as of the same effective date and time.

         The undersigned understands that the Company and the Initial Purchaser
will proceed with the Offering in reliance on this Lock-Up Letter Agreement.

         The undersigned hereby represents and warrants that the undersigned has
full power and authority to enter into this Lock-Up Letter Agreement and that,
upon request, the undersigned will execute any additional documents necessary in
connection with the enforcement hereof. Any obligations of the undersigned shall
be binding upon the heirs, personal Initial Purchaser, successors and assigns of
the undersigned.

                                                   Very truly yours,

                                                   By: /s/ David J. Brand
                                                       -----------------------
                                                       Name:  David J. Brand
                                                       Title: Managing Director

Dated:<PAGE>

                                                                 EXECUTION COPY

                      RESALE REGISTRATION RIGHTS AGREEMENT

                                      AMONG

                       L-3 COMMUNICATIONS HOLDINGS, INC.,
                                   THE COMPANY

                                       AND

                         L-3 COMMUNICATIONS CORPORATION,
                    HYGIENETICS ENVIRONMENTAL SERVICES, INC.,
                     L-3 COMMUNICATIONS ILEX SYSTEMS, INC.,
                      L-3 COMMUNICATIONS AYDIN CORPORATION,
                                   MPRI, INC.,
                   L-3 COMMUNICATIONS SPD TECHNOLOGIES, INC.,
                               SPD HOLDINGS, INC.,
                          SPD ELECTRICAL SYSTEMS, INC.,
                              SPD SWITCHGEAR, INC.,
                                 PAC ORD, INC.,
                                 HENSCHEL, INC.,
                              POWER PARAGON, INC.,
                         L-3 COMMUNICATIONS ESSCO, INC.,
                             ELECTRODYNAMICS, INC.,
                       INTERSTATE ELECTRONICS CORPORATION,
                       SOUTHERN CALIFORNIA MICROWAVE INC.,
                 L-3 COMMUNICATIONS STORM CONTROL SYSTEMS, INC.,
                   L-3 COMMUNICATIONS DBS MICROWAVE, INC. and
                              MICRODYNE CORPORATION
                                  AS GUARANTORS

                                       AND

                              LEHMAN BROTHERS INC.

                          DATED AS OF NOVEMBER 21, 2000

<PAGE>

     RESALE REGISTRATION RIGHTS AGREEMENT, dated as of November 21, 2000 between
L-3 Communications Holdings, Inc., a Delaware corporation (together with any
successor entity, herein referred to as the "Company"), and L-3 Communications
Corporation, a Delaware corporation ("L-3 Communications"), Hygienetics
Environmental Services, Inc., a Delaware corporation, L-3 Communications ILEX
Systems, Inc, a Delaware corporation, L-3 Communications Aydin Corporation, a
Delaware corporation, MPRI, Inc., a Delaware corporation, L-3 Communications SPD
Technologies, Inc., a Delaware corporation, SPD Holdings, Inc., a Delaware
corporation, SPD Electrical Systems, Inc., a Delaware corporation, SPD
Switchgear, Inc., a Delaware corporation, Pac Ord, Inc., a Delaware corporation,
Henschel, Inc., a Delaware corporation, Power Paragon, Inc., a Delaware
corporation, L-3 Communications ESSCO, Inc., a Delaware corporation,
Electrodynamics, Inc., an Arizona Corporation, Interstate Electronics
Corporation, a California Corporation, Southern California Microwave Inc, a
California corporation, L-3 Communications Storm Control Systems, Inc., a
California corporation, L-3 Communications DBS Microwave, Inc., a California
corporation and Microdyne Corporation, a Maryland corporation (collectively,
including L-3 Communications, the "Guarantors"), and Lehman Brothers Inc. (the
"Initial Purchaser").

     Pursuant to the Purchase Agreement, dated November 16, 2000, among the
Company, the Guarantors and the Initial Purchaser (the "Purchase Agreement"),
the Initial Purchaser has agreed to purchase from the Company up to $250,000,000
($300,000,000 if the Initial Purchaser exercises the over-allotment option in
full) in aggregate principal amount of the Company's 5.25% Convertible Senior
Subordinated Notes due 2009 (the "Notes"). The Notes will be convertible into
fully paid, nonassessable shares of common stock, par value $0.01 per share, of
the Company (the "Common Stock") on the terms, and subject to the conditions,
set forth in the Indenture (as defined herein). To induce the Initial Purchaser
to purchase the Notes, the Company and the Guarantors have agreed to provide the
registration rights set forth in this Agreement pursuant to Section 3(i) of the
Purchase Agreement.

     The parties hereby agree as follows:

     1. Definitions. As used in this Agreement, the following capitalized terms
shall have the following meanings:

   Advice:  As defined in Section 4(c)(ii) hereof.

   Affiliate:  As such term is defined in Rule 405 under the Securities Act.

   Agreement:  This Resale Registration Rights Agreement.

   Blue Sky Application:  As defined in Section 6(a) hereof.

   Broker-Dealer:  Any broker or dealer registered under the Exchange Act.

   Business Day:  A day other than a Saturday or Sunday or any federal holiday
      in the United States

   Closing Date:  The date of this Agreement.
<PAGE>

  Commission:  Securities and Exchange Commission.

  Common Stock:  As defined in the preamble hereto.

  Company:  As defined in the preamble hereto.

  Damages Payment Date:  Each Interest Payment Date.  For purposes of this
      Agreement, if no Notes are outstanding, "Damages Payment Date" shall mean
      each June 1 and December 1.

  Effectiveness Period:  As defined in Section 2(a)(iii) hereof.

  Effectiveness Target Date:  As defined in Section 2(a)(ii) hereof.

  Exchange Act:  Securities Exchange Act of 1934, as amended.

  Filing Deadline: As defined in Section 2(a)(i) hereof.

  Holder:  A Person who owns, beneficially or otherwise, Transfer Restricted
      Securities.

  Indemnified Holder:  As defined in Section 6(a) hereof.

  Indenture: The Indenture, dated as of November 21, 2000, among the Company,
      the Guarantors (as defined therein) and The Bank of New York, as trustee
      (the "Trustee"), pursuant to which the Notes are to be issued, as such
      Indenture is amended, modified or supplemented from time to time in
      accordance with the terms thereof.

  Initial Purchaser:  As defined in the preamble hereto.

  Interest Payment Date:  As defined in the Indenture.

  Liquidated Damages:  As defined in Section 3(a) hereof.

  Majority of Holders: Holders holding 50% in aggregate principal amount
       of the Notes outstanding at the time of determination of the Majority of
       Holders; provided, however, that, for purposes of this definition, a
       holder of shares of Common Stock which constitute Transfer Restricted
       Securities that were previously issued upon conversion of Notes shall be
       deemed to hold an aggregate principal amount of Notes (in addition to the
       principal amount of Notes held by such holder) equal to the product of
       (x) the number of such shares of Common Stock held by such holder and
       (y) the prevailing conversion price, such prevailing conversion price as
       determined in accordance with Section 12 of the Indenture.

  NASD:  National Association of Securities Dealers, Inc.

  Notes: As defined in the preamble hereto.

                         Registration Rights Agreement
<PAGE>

  Notice and Questionnaire: The Notice of Registration Statement and
           Selling Security Holder Election and Questionnaire in
           substantially the form attached or Exhibit A hereto.

  Person: An individual, partnership, corporation, unincorporated organization,
           trust, joint venture or a government or agency or political
           subdivision thereof.

  Prospectus: The prospectus included in a Registration Statement, as
           amended or supplemented by any prospectus supplement and by
           all other amendments thereto, including post-effective
           amendments, and all material incorporated by reference into
           such Prospectus.

  Questionnaire Deadline:  As defined in Section 2(b) hereof.

  Record Holder: With respect to any Damages Payment Date, each Person
           who is a Holder on the record date with respect to the
           Interest Payment Date on which such Damages Payment Date shall
           occur. In the case of a Holder of shares of Common Stock
           issued upon conversion of the Notes, "Record Holder" shall
           mean each Person who is a Holder of shares of Common Stock
           which constitute Transfer Restricted Securities on the May 15
           or November 15 immediately preceding the Damages Payment Date.

  Registration Default:  As defined in Section 3(a) hereof.

  Registration Statement:  As defined in Section 2(a)(i) hereof.

  Sale Notice:  As defined in Section 4(e) hereof.

  Securities Act:  Securities Act of 1933, as amended.

  Suspension Period.  As defined in Section 4(b)(i) hereof.

  TIA:  Trust Indenture Act of 1939, as in effect on the date the Indenture is
           qualified under the TIA.

  Transfer Restricted Securities:  Each Note and each share of Common Stock
           issued upon conversion of Notes until the earliest to occur of:

               (i) the date on which such Note or such share of Common Stock
          issued upon conversion has been effectively registered under the
          Securities Act and disposed of in accordance with the Registration
          Statement;

               (ii) the date on which such Note or such share of Common Stock
          issued upon conversion (A) has been transferred in compliance with
          Rule 144 under the Securities Act or (B) may be sold or transferred
          pursuant to Rule 144 under the Securities Act without regard to the
          volume limitations thereof (or any other similar provision then in
          force); and

                         Registration Rights Agreement
<PAGE>

               (iii) the date on which such Note or such share of Common Stock
          issued upon conversion ceases to be outstanding (whether as a result
          of redemption, repurchase and cancellation, conversion or otherwise).

    Underwritten Registration or Underwritten Offering: A registration in
          which securities of the Company are sold to an underwriter for
          reoffering to the public.

          2. Registration.

          (a) The Company and the Guarantors shall:

               (i) not later than 135 days after the earliest date of original
          issuance of any of the Notes (the "Filing Deadline"), cause a
          registration statement to be filed pursuant to Rule 415 under the
          Securities Act (the "Registration Statement"), which Registration
          Statement shall provide for resales of all Transfer Restricted
          Securities held by Holders that have provided the information required
          pursuant to the terms of Section 2(b) hereof;

               (ii) use all commercially reasonable efforts to cause the
          Registration Statement to be declared effective by the Commission as
          promptly as is practicable, but in no event later than 195 days after
          the earliest date of original issuance of any of the Notes (the
          "Effectiveness Target Date"); and

               (iii) use all commercially reasonable efforts to keep the
          Registration Statement continuously effective, supplemented and
          amended as required by the provisions of Section 4(b) hereof to the
          extent necessary to ensure that: (A) it is available for resales by
          the Holders of Transfer Restricted Securities entitled to the benefit
          of this Agreement and (B) conforms with the requirements of this
          Agreement and the Securities Act and the rules and regulations of the
          Commission promulgated thereunder as announced from time to time, for
          a period (the "Effectiveness Period") of:

                    (1) two years following the last date of original issuance
               of Notes; or

                    (2) such shorter period that will terminate when (x) all of
               the Holders of Transfer Restricted Securities (other than the
               Company and its Affiliates) are able to sell all Transfer
               Restricted Securities without restriction pursuant to the volume
               limitation provisions of Rule 144 under the Securities Act or any
               successor rule thereto, (y) when all Transfer Restricted
               Securities have ceased to be outstanding (whether as a result of
               redemption, repurchase and cancellation, conversion or otherwise)
               or (z) all Transfer Restricted Securities registered under the
               Registration Statement have been sold.

                         Registration Rights Agreement
<PAGE>

     (b) No Holder of Transfer Restricted Securities may include any of its
Transfer Restricted Securities in the Registration Statement pursuant to this
Agreement unless such Holder furnishes to the Company in writing, prior to or on
the 20th Business Day after the date the Notice and Questionnaire is given to
Holders (the "Questionnaire Deadline"), such information as the Company may
reasonably request for use in connection with the Registration Statement or
Prospectus or preliminary Prospectus included therein and in any application to
be filed with or under state securities laws. In connection with all such
requests for information from Holders of Transfer Restricted Securities, the
Company shall notify such Holders of the requirements set forth in the preceding
sentence. No Holder of Transfer Restricted Securities shall be entitled to
Liquidated Damages pursuant to Section 3 hereof unless such Holder shall have
provided all such reasonably requested information prior to or on the
Questionnaire Deadline. Each Holder as to which the Registration Statement is
being effected agrees to furnish promptly to the Company all information
required to be disclosed in order to make information previously furnished to
the Company by such Holder not materially misleading.

     3. Liquidated Damages.

     (a) If:

          (i) the Registration Statement is not filed with the Commission prior
     to or on the Filing Deadline;

          (ii) the Registration Statement has not been declared effective by the
     Commission prior to or on the Effective Target Date;

          (iii) subject to the provisions of Section 4(b)(i) hereof, the
     Registration Statement is filed and declared effective but, during the
     Effectiveness Period, shall thereafter cease to be effective or fail to be
     usable for its intended purpose without being succeeded within five
     Business Days by a post-effective amendment to the Registration Statement
     or a report filed with the Commission pursuant to Section 13(a), 13(c), 14
     or 15(d) of the Exchange Act that cures such failure and, in the case of a
     post-effective amendment, is itself immediately declared effective; or

          (iv) prior to or on the 45th or 60th day, as the case may be, of any
     Suspension Period, such suspension has not been terminated,

(each such event referred to in foregoing clauses (i) through (iv), a
"Registration Default"), the Company and the Guarantors jointly and severally
hereby agree to pay liquidated damages ("Liquidated Damages") with respect to
the Transfer Restricted Securities from and including the day following the
Registration Default to but excluding the day on which the Registration Default
has been cured which shall accrue as follows:

                         (A) in respect of the Notes, to each holder of Notes,
                    (x) during the first 90-day period during which a
                    Registration Default shall have occurred and be continuing,
                    at the rate of an additional 0.25% of the principal amount
                    of the Notes per year, and (y) during the period

                         Registration Rights Agreement

<PAGE>

                    commencing on the 91st day following the day the
                    Registration Default shall have occurred and be continuing,
                    at the rate of an additional 0.50% of the principal amount
                    of the Notes per year; provided that in no event shall
                    Liquidated Damages accrue at a rate per year exceeding 0.50%
                    of the principal amount of the Notes; and

                         (B) in respect of any shares of Common Stock issued
                    upon conversion of Notes, to each holder of such shares of
                    Common Stock, (x) during the first 90-day period in which a
                    Registration Default shall have occurred and be continuing,
                    at the rate of an additional 0.25% of the principal amount
                    of the Notes converted into such shares of Common Stock per
                    year, and (y) during the period commencing the 91st day
                    following the day the Registration Default shall have
                    occurred and be continuing, at the rate of an additional
                    0.50% of the principal amount of the Notes converted into
                    such shares of Common Stock per year; provided, however,
                    that in no event shall Liquidated Damages accrue at a rate
                    per year exceeding 0.50% of the principal amount of the
                    Notes converted into such shares of Common Stock.

     (b) All accrued Liquidated Damages shall be paid in arrears to Record
Holders by the Company or the Guarantors on each Damages Payment Date by wire
transfer of immediately available funds. Following the cure of all Registration
Defaults relating to any particular Note or share of Common Stock issued upon
conversion of Notes, the accrual of Liquidated Damages with respect to such Note
or such share of Common Stock shall cease.

     All obligations of the Company and the Guarantors to pay Liquidated Damages
set forth in this Section 3 with respect to any Transfer Restricted Security at
the time such security ceases to be a Transfer Restricted Security shall survive
until such time as all such obligations with respect to such Transfer Restricted
Security shall have been satisfied in full provided, however, that the
Liquidated Damages shall cease to accrue on the day immediately prior to the
date such Transfer Restricted Securities cease to be Transfer Restricted
Securities.

     The Liquidated Damages set forth above shall be the exclusive monetary
remedy available to the Holders of Transfer Restricted Securities for
Registration Defaults.

     4. Registration Procedures.

     (a) In connection with the Registration Statement, the Company and the
Guarantors shall comply with all the provisions of Section 4(b) hereof and shall
use all reasonable efforts to effect such registration to permit the sale of the
Transfer Restricted Securities being sold in accordance with the intended method
or methods of distribution thereof, and pursuant thereto, shall prepare and file
with the Commission a Registration Statement relating to the registration on any
appropriate form under the Securities Act.

     (b) In connection with the Registration Statement and any Prospectus
required by this Agreement to permit the sale or resale of Transfer Restricted
Securities, the Company and the Guarantors shall:

                         Registration Rights Agreement
<PAGE>

          (i) Subject to any notice by the Company and the Guarantors in
     accordance with this Section 4(b) of the existence of any fact or event of
     the kind described in Section 4(b)(iii)(D), use its reasonable efforts to
     keep the Registration Statement continuously effective during the
     Effectiveness Period; upon the occurrence of any event that would cause any
     the Registration Statement or the Prospectus contained therein (A) to
     contain a material misstatement or omission or (B) not be effective and
     usable for the resale of Transfer Restricted Securities during the
     Effectiveness Period, the Company and the Guarantors shall file promptly an
     appropriate amendment to the Registration Statement or a report filed with
     the Commission pursuant to Section 13(a), 13(c), 14 or 15(d) of the
     Exchange Act, in the case of clause (A), correcting any such misstatement
     or omission, and, in the case of either clause (A) or (B), use all
     reasonable efforts to cause such amendment to be declared effective and the
     Registration Statement and the related Prospectus to become usable for
     their intended purposes as soon as practicable thereafter. Notwithstanding
     the foregoing, the Company and the Guarantors may suspend the effectiveness
     of the Registration Statement by written notice to the Holders for a period
     not to exceed an aggregate of 45 days in any 90-day period (each such
     period, a "Suspension Period") if:

               (x) an event occurs and is continuing as a result of which the
          Registration Statement would, in the Company's and the Guarantors'
          reasonable judgment, contain an untrue statement of a material fact or
          omit to state a material fact required to be stated therein or
          necessary to make the statements therein not misleading; and

               (y) the Company and the Guarantors reasonably determine that the
          disclosure of such event at such time would have a material adverse
          effect on the business of the Company and the Guarantors (and their
          subsidiaries, if any, taken as a whole);

     provided, however, that in the event the disclosure relates to a previously
     undisclosed proposed or pending material business transaction, the
     disclosure of which would impede the Company's and the Guarantors' ability
     to consummate such transaction, the Company and the Guarantors may extend a
     Suspension Period from 45 days to 60 days; provided, however, that
     Suspension Periods shall not exceed an aggregate of 90 days in any 360-day
     period.

          (ii) Prepare and file with the Commission such amendments and
     post-effective amendments to the Registration Statement as may be necessary
     to keep the Registration Statement effective during the Effectiveness
     Period; cause the Prospectus to be supplemented by any required Prospectus
     supplement, and as so supplemented to be filed pursuant to Rule 424 under
     the Securities Act, and to comply fully with the applicable provisions of
     Rules 424 and 430A under the Securities Act in a timely manner; and comply
     with the provisions of the Securities Act with respect to the disposition
     of all securities covered by the Registration Statement during the
     applicable period in accordance with the

                         Registration Rights Agreement

<PAGE>

     intended method or methods of distribution by the sellers thereof set forth
     in the Registration Statement or supplement to the Prospectus.

          (iii) Advise the underwriter(s), if any, and selling Holders promptly
     (but in any event within five Business Days) and, if requested by such
     Persons, to confirm such advice in writing:

               (A) when the Prospectus or any Prospectus supplement or
          post-effective amendment has been filed, and, with respect to the
          Registration Statement or any post-effective amendment thereto, when
          the same has become effective,

               (B) of any request by the Commission for amendments to the
          Registration Statement or amendments or supplements to the Prospectus
          or for additional information relating thereto,

               (C) of the issuance by the Commission of any stop order
          suspending the effectiveness of the Registration Statement under the
          Securities Act or of the suspension by any state securities commission
          of the qualification of the Transfer Restricted Securities for
          offering or sale in any jurisdiction, or the initiation of any
          proceeding for any of the preceding purposes, or

               (D) of the existence of any fact or the happening of any event,
          during the Effectiveness Period, that makes any statement of a
          material fact made in the Registration Statement, the Prospectus, any
          amendment or supplement thereto, or any document incorporated by
          reference therein untrue, or that requires the making of any additions
          to or changes in the Registration Statement or the Prospectus in order
          to make the statements therein not misleading.

     Each Holder of this Security, by accepting the same, agrees to hold any
communication from the Company and the Guarantors pursuant to this paragraph
4(b)(iii) in confidence.

          (iv) If at any time the Commission shall issue any stop order
     suspending the effectiveness of the Registration Statement, or any state
     securities commission or other regulatory authority shall issue an order
     suspending the qualification or exemption from qualification of the
     Transfer Restricted Securities under state securities or Blue Sky laws, use
     its reasonable efforts to obtain the withdrawal or lifting of such order at
     the earliest possible time.

          (v) Furnish to each of the selling Holders and each of the
     underwriter(s), if any, before filing with the Commission, a copy of the
     Registration Statement and copies of any Prospectus included therein (other
     than documents incorporated by reference after the initial filing of the
     Registration Statement), which documents will be subject to the review of
     such Holders and

                         Registration Rights Agreement
<PAGE>

     underwriter(s), if any, for a period of at least ten Business Days, and the
     Company and the Guarantors will not file the Registration Statement or
     Prospectus (other than documents incorporated by reference) to which a
     selling Holder of Transfer Restricted Securities covered by the
     Registration Statement or the underwriter(s), if any, shall reasonably
     object within five Business Days after the receipt thereof. The Company and
     the Guarantors shall also furnish to each of the selling Holders and each
     of the underwriter(s), if any, before filing with the Commission, if
     reasonably practicable, or otherwise promptly after filing with the
     Commission, copies of any amendments to the Registration Statement or
     supplements to the Prospectus (other than documents incorporated by
     reference after the initial filing of the Registration Statement), and to
     make the Company's and the Guarantors' representatives available for
     discussion of such amendments or supplements and make such changes in such
     amendments or supplements prior to the filing thereof, if reasonably
     practicable, or prepare and file further amendments or supplements, as the
     selling Holders or underwriter(s), if any, may reasonably request. A
     selling Holder or underwriter, if any, shall be deemed to have reasonably
     objected to such filing if the Registration Statement, amendment,
     Prospectus or supplement, as applicable, as proposed to be filed, contains
     a material misstatement or omission.

          (vi) Make available at reasonable times for inspection by one or more
     representatives of the selling Holders, designated in writing by a Majority
     of Holders whose Transfer Restricted Securities are included in the
     Registration Statement, any underwriter participating in any distribution
     pursuant to the Registration Statement, and any attorney or accountant
     retained by such selling Holders or any of the underwriter(s), all
     financial and other records, pertinent corporate documents and properties
     of the Company and the Guarantors as shall be reasonably necessary to
     enable them to exercise any applicable due diligence responsibilities, and
     cause the Company's and the Guarantors' officers, directors, managers and
     employees to supply all information reasonably requested by any such
     representative or representatives of the selling Holders, underwriter,
     attorney or accountant in connection with the Registration Statement after
     the filing thereof and before its effectiveness; provided, however, that
     any information designated by the Company as confidential at the time of
     delivery of such information shall be kept confidential by the recipient
     thereof; provided further, that in no event shall the Company be required
     to furnish any material nonpublic information pursuant to this subsection
     (vi).

          (vii) If reasonably requested by any selling Holders or the
     underwriter(s), if any, promptly incorporate in the Registration Statement
     or Prospectus, pursuant to a supplement or post-effective amendment if
     necessary, such information as such selling Holders and underwriter(s), if
     any, may request to have included therein, including, without limitation:
     (A) information relating to the "Plan of Distribution" of the Transfer
     Restricted Securities, (B) information with respect to the principal amount
     of Notes or number of shares of Common Stock being sold to such
     underwriter(s), (C) the purchase price being paid therefor

                         Registration Rights Agreement

<PAGE>

     and (D) any other terms of the offering of the Transfer Restricted
     Securities to be sold in such offering; provided, however, that with
     respect to any information requested for inclusion by a selling Holder,
     this clause (vii) shall apply only to such information that relates to the
     Transfer Restricted Securities to be sold by such selling Holder; and make
     all required filings of such Prospectus supplement or post-effective
     amendment as soon as reasonably practicable after the Company is notified
     of the matters to be incorporated in such Prospectus supplement or
     post-effective amendment.

          (viii) Furnish to each selling Holder and each of the underwriter(s),
     if any, without charge, at least one copy of the Registration Statement, as
     first filed with the Commission, and of each amendment thereto (and any
     documents incorporated by reference therein or exhibits thereto (or
     exhibits incorporated in such exhibits by reference) as such Person may
     request).

          (ix) Deliver to each selling Holder and each of the underwriter(s), if
     any, without charge, as many copies of the Prospectus (including each
     preliminary prospectus) and any amendment or supplement thereto as such
     Persons reasonably may request; subject to any notice by the Company in
     accordance with this Section 4(b) of the existence of any fact or event of
     the kind described in Section 4(b)(iii)(D), the Company and the Guarantors
     hereby consent to the use of the Prospectus and any amendment or supplement
     thereto by each of the selling Holders and each of the underwriter(s), if
     any, in connection with the offering and the sale of the Transfer
     Restricted Securities covered by the Prospectus or any amendment or
     supplement thereto.

          (x) If an underwriting agreement is entered into and the registration
     is an Underwritten Registration, the Company and the Guarantors shall:

               (A) upon request, furnish to each underwriter and, in the case of
          clause (1), to each selling Holder, in such substance and scope as
          they may reasonably request and as are customarily made by issuers to
          underwriters in primary underwritten offerings, upon the date of
          closing of any sale of Transfer Restricted Securities in an
          Underwritten Registration:

                    (1) a certificate, dated the date of such closing, signed by
               the Chief Financial Officer of the Company and each of the
               Guarantors confirming, as of the date thereof, the matters set
               forth in Section 5(h) of the Purchase Agreement and such other
               matters as such parties may reasonably request;

                    (2) opinions, each dated the date of such closing, of
               counsel to the Company covering such of the matters as are
               customarily covered in legal opinions to underwriters in
               connection with primary underwritten offerings of securities; and

                         Registration Rights Agreement
<PAGE>

                    (3) customary comfort letters, dated the date of such
               closing, from the Company's independent accountants (and from any
               other accountants whose report is contained or incorporated by
               reference in the Registration Statement), in the customary form
               and covering matters of the type customarily covered in comfort
               letters to underwriters in connection with primary underwritten
               offerings of securities;

               (B) set forth in full in the underwriting agreement, if any,
          indemnification provisions and procedures which provide rights no less
          protective than those set forth in Section 6 hereof with respect to
          all parties to be indemnified by the Company and the Guarantors; and

               (C) deliver such other documents and certificates as may be
          reasonably requested by such parties to evidence compliance with
          clause (A) above and with any customary conditions contained in the
          underwriting agreement or other agreement entered into by the selling
          Holders pursuant to this clause (x).

          (xi) Before any public offering of Transfer Restricted Securities,
     cooperate with the selling Holders, the underwriter(s), if any, and their
     respective counsel in connection with the registration and qualification of
     the Transfer Restricted Securities under the securities or Blue Sky laws of
     such jurisdictions as the selling Holders or underwriter(s), if any, may
     reasonably request and do any and all other acts or things necessary or
     advisable to enable the disposition in such jurisdictions of the Transfer
     Restricted Securities covered by the Registration Statement; provided,
     however, that the Company and the Guarantors shall not be required (A) to
     register or qualify as a foreign corporation or a dealer of securities
     where it is not now so qualified or to take any action that would subject
     it to the service of process in any jurisdiction where it is not now so
     subject or (B) to subject themselves to taxation in any such jurisdiction
     if they are not now so subject.

          (xii) Cooperate with the selling Holders and the underwriter(s), if
     any, to facilitate the timely preparation and delivery of certificates
     representing Transfer Restricted Securities to be sold and not bearing any
     restrictive legends (unless required by applicable securities laws) and
     enable such Transfer Restricted Securities to be in such denominations and
     registered in such names as the Holders or the underwriter(s), if any, may
     request at least two Business Days before any sale of Transfer Restricted
     Securities made by such underwriter(s).

          (xiii) Use all reasonable efforts to cause the Transfer Restricted
     Securities covered by the Registration Statement to be registered with or
     approved by such other U.S. governmental agencies or authorities as may be
     necessary to enable the seller or sellers thereof or the underwriter(s), if
     any, to consummate the disposition of such Transfer Restricted Securities.

                         Registration Rights Agreement
<PAGE>

          (xiv) Subject to Section 4(b)(i) hereof, if any fact or event
     contemplated by Section 4(b)(iii)(D) hereof shall exist or have occurred,
     use all reasonable efforts to prepare a supplement or post-effective
     amendment to the Registration Statement or related Prospectus or any
     document incorporated therein by reference or file any other required
     document so that, as thereafter delivered to the purchasers of Transfer
     Restricted Securities, the Prospectus will not contain an untrue statement
     of a material fact or omit to state any material fact required to be stated
     therein or necessary to make the statements therein not misleading.

          (xv) Provide CUSIP numbers for all Transfer Restricted Securities not
     later than the effective date of the Registration Statement and provide the
     Trustee under the Indenture with certificates for the Notes that are in a
     form eligible for deposit with The Depository Trust Company.

          (xvi) Cooperate and assist in any filings required to be made with the
     NASD and in the performance of any due diligence investigation by any
     underwriter that is required to be retained in accordance with the rules
     and regulations of the NASD.

          (xvii) Otherwise use their best efforts to comply with all applicable
     rules and regulations of the Commission and all reporting requirements
     under the rules and regulations of the Exchange Act.

          (xviii) Cause the Indenture to be qualified under the TIA not later
     than the effective date of the Registration Statement required by this
     Agreement, and, in connection therewith, cooperate with the Trustee and the
     holders of Notes to effect such changes to the Indenture as may be required
     for such Indenture to be so qualified in accordance with the terms of the
     TIA, and execute and use all reasonable efforts to cause the Trustee
     thereunder to execute all documents that may be required to effect such
     changes and all other forms and documents required to be filed with the
     Commission to enable such Indenture to be so qualified in a timely manner.

          (xix) Cause all Transfer Restricted Securities covered by the
     Registration Statement to be listed or quoted, as the case may be, on each
     securities exchange or automated quotation system on which similar
     securities issued by the Company are then listed or quoted.

          (xx) Provide promptly to each Holder upon written request each
     document filed with the Commission pursuant to the requirements of Section
     13 and Section 15 of the Exchange Act after the effective date of the
     Registration Statement.

          (xxi) If reasonably requested by the underwriters, if any, make
     appropriate officers of the Company and the Guarantors reasonably available
     to the underwriters for meetings with prospective purchasers of the
     Transfer Restricted Securities and prepare and present to potential
     investors customary

                         Registration Rights Agreement

<PAGE>

     "road show" material in a manner consistent with other new issuances of
     other securities similar to the Transfer Restricted Securities.

     (c) Each Holder agrees by acquisition of a Transfer Restricted Security
that, upon receipt of any notice from the Company of the existence of any fact
of the kind described in Section 4(b)(iii)(D) hereof, such Holder will, and will
use its reasonable efforts to cause any underwriter(s) in an Underwritten
Offering to, forthwith discontinue disposition of Transfer Restricted Securities
pursuant to the Registration Statement until:

          (i) such Holder has received copies of the supplemented or amended
     Prospectus contemplated by Section 4(b)(xv) hereof; or

          (ii) such Holder is advised in writing (the "Advice") by the Company
     that the use of the Prospectus may be resumed, and has received copies of
     any additional or supplemental filings that are incorporated by reference
     in the Prospectus.

If so directed by the Company, each Holder will deliver to the Company (at the
Company's expense) all copies, other than permanent file copies then in such
Holder's possession, of the Prospectus covering such Transfer Restricted
Securities that was current at the time of receipt of such notice of suspension.

     (d) Each Holder who intends to be named as a selling Holder in the
Registration Statement shall furnish to the Company in writing, no later than
the Questionnaire Deadline, such information regarding such Holder and the
proposed distribution by such Holder of its Transfer Restricted Securities as
the Company may reasonably request for use in connection with the Registration
Statement or Prospectus or preliminary Prospectus included therein. Holders that
do not complete the questionnaire and deliver it to the Company shall not be
named as selling securityholders in the Prospectus or preliminary Prospectus
included in the Registration Statement and therefore shall not be permitted to
sell any Transfer Restricted Securities pursuant to the Registration Statement.
Each Holder who intends to be named as a selling Holder in the Registration
Statement shall promptly furnish to the Company in writing such other
information as the Company may from time to time reasonably request in writing.

     (e) Upon the effectiveness of the Registration Statement, each Holder shall
notify the Company at least three Business Days prior to any intended
distribution of Transfer Restricted Securities pursuant to the Registration
Statement (a "Sale Notice"), which notice shall be effective for five Business
Days. Each Holder of this Security, by accepting the same, agrees to hold any
communication by the Company in response to a Sale Notice in confidence.

     5. Registration Expenses.

     (a) All expenses incident to the Company's and the Guarantors' performance
of or compliance with this Agreement shall be borne by the Company regardless of
whether a Registration Statement becomes effective, including, without
limitation:

                         Registration Rights Agreement
<PAGE>

                 (i) all registration and filing fees and expenses (including
         filings made by any Initial Purchaser or Holders with the NASD);

                 (ii) all fees and expenses of compliance with federal
         securities and state Blue Sky or securities laws;

                 (iii) all expenses of printing (including printing of
         Prospectuses and certificates for the Common Stock to be issued upon
         conversion of the Notes), messenger and delivery services and
         telephone;

                 (iv) all fees and disbursements of counsel to the Company and
         the Guarantors and, subject to Section 5(b) below, the Holders of
         Transfer Restricted Securities;

                 (v) all application and filing fees in connection with listing
         (or authorizing for quotation) the Common Stock on a national
         securities exchange or automated quotation system pursuant to the
         requirements hereof; and

                 (vi) all fees and disbursements of independent certified
         public accountants of the Company (including the expenses of any
         special audit and comfort letters required by or incident to such
         performance).

     The Company shall bear its and the Guarantors' internal expenses
(including, without limitation, all salaries and expenses of its officers and
employees performing legal, accounting or other duties), the expenses of any
annual audit and the fees and expenses of any Person, including special experts,
retained by the Company.

     (b) In connection with the Registration Statement required by this
Agreement, the Company shall reimburse the Initial Purchaser and the Holders of
Transfer Restricted Securities being registered pursuant to the Registration
Statement, as applicable, for the reasonable fees and disbursements not to
exceed the amount of $50,000 of not more than one counsel, which shall be Latham
& Watkins, or such other counsel as may be chosen by a Majority of Holders for
whose benefit the Registration Statement is being prepared.

     6. Indemnification and Contribution.

     (a) The Company shall indemnify and hold harmless each Holder, such
Holder's officers and employees and each person, if any, who controls such
Holder within the meaning of the Securities Act (each, an "Indemnified Holder"),
from and against any loss, claim, damage or liability, joint or several, or any
action in respect thereof (including, but not limited to, any loss, claim,
damage, liability or action relating to resales of the Transfer Restricted
Securities), to which such Indemnified Holder may become subject, insofar as any
such loss, claim, damage, liability or action arises out of, or is based upon:

          (i) any untrue statement or alleged untrue statement of a material
     fact contained in (A) the Registration Statement or Prospectus or any
     amendment or supplement thereto or (B) any blue sky application or other
     document or any

                         Registration Rights Agreement
<PAGE>

     amendment or supplement thereto prepared or executed by the Company (or
     based upon written information furnished by or on behalf of the Company
     expressly for use in such blue sky application or other document or
     amendment on supplement) filed in any jurisdiction specifically for the
     purpose of qualifying any or all of the Transfer Restricted Securities
     under the securities law of any state or other jurisdiction (such
     application or document being hereinafter called a "Blue Sky Application");
     or

          (ii) the omission or alleged omission to state therein any material
     fact required to be stated therein or necessary to make the statements
     therein, in the light of the circumstances under which they were made, not
     misleading,

and shall reimburse each Indemnified Holder promptly upon demand for any legal
or other expenses reasonably incurred by such Indemnified Holder in connection
with investigating or defending or preparing to defend against any such loss,
claim, damage, liability or action as such expenses are incurred; provided,
however, that the Company and the Guarantors shall not be liable in any such
case to the extent that any such loss, claim, damage, liability or action arises
out of, or is based upon, any untrue statement or alleged untrue statement or
omission or alleged omission made in the Registration Statement or Prospectus or
amendment or supplement thereto or Blue Sky Application in reliance upon and in
conformity with written information furnished to the Company by or on behalf of
any Holder (or its related Indemnified Holder) specifically for use therein or
out of the failure by the Indemnified Holder to furnish to any purchaser of its
Restricted Transfer Security of the Prospectus and any supplement or amendment
thereto in the form provided to such Indemnified Holder by the Company. The
foregoing indemnity agreement is in addition to any liability which the Company
and the Guarantors may otherwise have to any Indemnified Holder.

          (b) Each Holder, severally and not jointly, shall indemnify and hold
     harmless the Company and the Guarantors, their respective officers and
     employees, their respective directors and each person, if any, who controls
     the Company or the Guarantors within the meaning of the Securities Act,
     from and against any loss, claim, damage or liability, joint or several, or
     any action in respect thereof, to which the Company, the Guarantors or any
     such director, officer, employee or controlling person may become subject,
     insofar as any such loss, claim, damage or liability or action arises out
     of, or is based upon:

               (i) any untrue statement or alleged untrue statement of any
          material fact contained in the Registration Statement or Prospectus or
          any amendment or supplement thereto or any Blue Sky Application; or

               (ii) the omission or the alleged omission to state therein any
          material fact required to be stated therein or necessary to make the
          statements therein, in light of the circumstances under which they
          were made, not misleading,

but in each case only to the extent that such untrue statement or alleged untrue
statement or omission or alleged omission was made in reliance upon and in
conformity with written information furnished to the Company by or on behalf of
such Holder (or its related Indemnified

                         Registration Rights Agreement

<PAGE>

Holder) specifically for use therein, and shall reimburse the Company, the
Guarantors and any such directors, officer, employee or controlling person
promptly upon demand for any legal or other expenses reasonably incurred by the
Company, the Guarantors or any such director, officer, employee or controlling
person in connection with investigating or defending or preparing to defend
against any such loss, claim, damage, liability or action as such expenses are
incurred. The foregoing indemnity agreement is in addition to any liability
which any Holder may otherwise have to the Company, the Guarantors or any of
their respective directors, officers, employees or controlling persons and any
such director, officer, employee or controlling person.

     (c) Promptly after receipt by an indemnified party under this Section 6 of
notice of any claim or the commencement of any action, the indemnified party
shall, if a claim in respect thereof is to be made against the indemnifying
party under this Section 6, notify the indemnifying party in writing of the
claim or the commencement of that action; provided, however, that the failure to
notify the indemnifying party shall not relieve it from any liability which it
may have under this Section 6 except to the extent it has been materially
prejudiced by such failure; and provided, further, that the failure to notify
the indemnifying party shall not relieve it from any liability which it may have
to an indemnified party otherwise than under this Section 6. If any such claim
or action shall be brought against an indemnified party, and it shall notify the
indemnifying party thereof, the indemnifying party shall be entitled to
participate therein and, to the extent that it wishes, jointly with any other
similarly notified indemnifying party, to assume the defense thereof with
counsel satisfactory to the indemnified party. After notice from the
indemnifying party to the indemnified party of its election to assume the
defense of such claim or action, the indemnifying party shall not be liable to
the indemnified party under this Section 6 for any legal or other expenses
subsequently incurred by the indemnified party in connection with the defense
thereof other than reasonable costs of investigation; provided, however, that a
Majority of Holders shall have the right to employ a single counsel to represent
jointly a Majority of Holders and their respective officers, employees and
controlling persons who may be subject to liability arising out of any claim in
respect of which indemnity may be sought by a Majority of Holders against the
Company, the Guarantors or any of their respective directors, officers,
employees or controlling persons under this Section 7; and provided, further,
that if a Majority of Holders shall have reasonably concluded that there may be
one or more legal defenses available to them and their respective officers,
employees and controlling persons that are different from or additional to those
available to the Company, the Guarantors and any of their respective directors,
officers, employees and controlling persons, the fees and expenses of a single
separate counsel shall be paid by the Company and the Guarantors. No
indemnifying party shall:

          (i) without the prior written consent of the indemnified parties
     (which consent shall not be unreasonably withheld) settle or compromise or
     consent to the entry of any judgment with respect to any pending or
     threatened claim, action, suit or proceeding in respect of which
     indemnification or contribution may be sought hereunder (whether or not the
     indemnified parties are actual or potential parties to such claim or
     action) unless such settlement, compromise or consent includes an
     unconditional release of each indemnified party seeking indemnification
     hereunder from all liability arising out of such claim, action, suit or
     proceeding, or

                         Registration Rights Agreement
<PAGE>

          (ii) be liable for any settlement of any such action effected without
     its written consent (which consent shall not be unreasonably withheld), but
     if settled with its written consent or if there be a final judgment for the
     plaintiff in any such action, the indemnifying party agrees to indemnify
     and hold harmless any indemnified party from and against any loss or
     liability by reason of such settlement or judgment.

     (d) If the indemnification provided for in this Section 6 shall for any
reason be unavailable or insufficient to hold harmless an indemnified party
under Section 6(a) or 6(b) in respect of any loss, claim, damage or liability
(or action in respect thereof) referred to therein, each indemnifying party
shall, in lieu of indemnifying such indemnified party, contribute to the amount
paid or payable by such indemnified party as a result of such loss, claim,
damage or liability (or action in respect thereof):

          (i) in such proportion as is appropriate to reflect the relative
     benefits received by the Company and the Guarantors from the offering and
     sale of the Transfer Restricted Securities on the one hand and a Holder
     with respect to the sale by such Holder of the Transfer Restricted
     Securities on the other, or

          (ii) if the allocation provided by clause (6)(d)(i) is not permitted
     by applicable law, in such proportion as is appropriate to reflect not only
     the relative benefits referred to in clause 6(d)(i) but also the relative
     fault of the Company on the one hand and the Holder on the other in
     connection with the statements or omissions or alleged statements or
     alleged omissions that resulted in such loss, claim, damage or liability
     (or action in respect thereof), as well as any other relevant equitable
     considerations.

The relative benefits received by the Company and the Guarantors on the one hand
and a Holder on the other with respect to such offering and such sale shall be
deemed to be in the same proportion as the total net proceeds from the offering
of the Notes purchased under the Purchase Agreement (before deducting expenses)
received by the Company and the Guarantors as set forth in the table on Schedule
1 hereto, on the one hand, bear to the total proceeds received by such Holder
with respect to its sale of Transfer Restricted Securities on the other. The
relative fault of the parties shall be determined by reference to whether the
untrue or alleged untrue statement of a material fact or the omission or alleged
omission to state a material fact relates to information supplied by the Company
or the Guarantors on the one hand or the Holders on the other, the intent of the
parties and their relative knowledge, access to information and opportunity to
correct or prevent such statement or omission. The Company, the Guarantors and
each Holder agree that it would not be just and equitable if the amount of
contribution pursuant to this Section 6(d) were determined by pro rata
allocation or by any other method of allocation that does not take into account
the equitable considerations referred to in the first sentence of this paragraph
(d). The amount paid or payable by an indemnified party as a result of the loss,
claim, damage or liability, or action in respect thereof, referred to above in
this Section 6 shall be deemed to include, for purposes of this Section 6, any
legal or other expenses reasonably incurred by such indemnified party in
connection with investigating or defending or preparing to defend any such
action or claim. Notwithstanding the provisions of this Section 6, no Holder
shall be required to

                         Registration Rights Agreement
<PAGE>

contribute any amount in excess of the amount by which the total price at which
the Transfer Restricted Securities purchased by it were resold exceeds the
amount of any damages which such Holder has otherwise been required to pay by
reason of any untrue or alleged untrue statement or omission or alleged
omission. No person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Securities Act) shall be entitled to contribution from
any person who was not guilty of such fraudulent misrepresentation. The Holders'
obligations to contribute as provided in this Section 6(d) are several and not
joint.

     7. Rule 144A. In the event the Company is not subject to Section 13 or
15(d) of the Exchange Act, the Company and each of the Guarantors hereby agrees
with each Holder, for so long as any Transfer Restricted Securities remain
outstanding, to make available to any Holder or beneficial owner of Transfer
Restricted Securities in connection with any sale thereof and any prospective
purchaser of such Transfer Restricted Securities from such Holder or beneficial
owner, the information required by Rule 144A(d)(4) under the Securities Act in
order to permit resales of such Transfer Restricted Securities pursuant to Rule
144A.

     8. Participation in Underwritten Registrations. No Holder may participate
in any Underwritten Registration hereunder unless such Holder:

          (i) agrees to sell such Holder's Transfer Restricted Securities on the
     basis provided in any underwriting arrangements approved by the Persons
     entitled hereunder to approve such arrangements; and

          (ii) completes and executes all reasonable questionnaires, powers of
     attorney, indemnities, underwriting agreements, lock-up letters and other
     documents required under the terms of such underwriting arrangements.

     9. Selection of Underwriters. The Holders of Transfer Restricted Securities
covered by the Registration Statement who desire to do so may sell such Transfer
Restricted Securities in an Underwritten Offering. In any such Underwritten
Offering, the investment banker or investment bankers and manager or managers
that will administer the offering will be selected by a Majority of Holders
whose Transfer Restricted Securities are included in such offering; provided,
however, that such investment bankers and managers must be reasonably
satisfactory to the Company.

                         Registration Rights Agreement
<PAGE>

     10. Miscellaneous.

     (a) Remedies. The Company and the Guarantors acknowledge and agree that any
failure by the Company or the Guarantors to comply with its obligations under
Section 2 hereof may result in material irreparable injury to the Initial
Purchaser or the Holders for which there is no adequate remedy at law, that it
will not be possible to measure damages for such injuries precisely and that, in
the event of any such failure, the Initial Purchaser or any Holder may obtain
such relief as may be required to specifically enforce the Company's obligations
under Section 2 hereof. The Company and the Guarantors further agree to waive
the defense in any action for specific performance that a remedy at law would be
adequate.

     (b) Adjustments Affecting Transfer Restricted Securities. The Company and
the Guarantors shall not, directly or indirectly, take any action with respect
to the Transfer Restricted Securities as a class that would adversely affect the
ability of the Holders of Transfer Restricted Securities to include such
Transfer Restricted Securities in a registration undertaken pursuant to this
Agreement.

     (c) No Inconsistent Agreements. The Company and the Guarantors will not, on
or after the date of this Agreement, enter into any agreement with respect to
its securities that interferes with the rights granted to the Holders in this
Agreement or otherwise conflicts with the provisions hereof. In addition, the
Company and the Guarantors shall not grant to any of its security holders (other
than the holders of Transfer Restricted Securities in such capacity) the right
to include any of its securities in the Registration Statement provided for in
this Agreement other than the Transfer Restricted Securities. Except for the
obligation described in the Purchase Agreement to the sellers of the ILEX
Systems, Inc. business, the Company and the Guarantors have not previously
entered into any agreement (which has not expired or been terminated) granting
any registration rights with respect to its securities to any Person which
rights conflict with the provisions hereof.

     (d) Amendments and Waivers. This Agreement may not be amended, modified or
supplemented, and waivers or consents to or departures from the provisions
hereof may not be given, unless the Company has obtained the written consent of
a Majority of Holders.

     (e) Notices. All notices and other communications provided for or permitted
hereunder shall be made in writing by hand-delivery, first-class mail
(registered or certified, return receipt requested), telex, telecopier, or air
courier guaranteeing overnight delivery:

          (i) if to a Holder, at the address set forth on the records of the
     registrar under the Indenture or the transfer agent of the Common Stock, as
     the case may be; and

          (ii) if to the Company or the Guarantors:

               L-3 Communications Holdings, Inc.
               600 Third Avenue, 36th Floor
               New York, New York  10016
               Attn:  Christopher Cambria

                         Registration Rights Agreement
<PAGE>

                      With a copy to:

                      Simpson Thacher & Bartlett
                      425 Lexington Avenue
                      New York, New York  10017
                      Attn:  Vincent Pagano, Jr.

     All such notices and communications shall be deemed to have been duly given
at: the time delivered by hand, if personally delivered; five Business Days
after being deposited in the mail, postage prepaid, if mailed; when answered
back, if telexed; when receipt acknowledged, if telecopied; and on the next
Business Day, if timely delivered to an air courier guaranteeing overnight
delivery.

     (f) Successors and Assigns. This Agreement shall inure to the benefit of
and be binding upon the successors and assigns of each of the parties, including
without limitation and without the need for an express assignment, subsequent
Holders of Transfer Restricted Securities; provided, however, that (i) this
Agreement shall not inure to the benefit of or be binding upon a successor or
assign of a Holder unless and to the extent such successor or assign acquired
Transfer Restricted Securities from such Holder and (ii) nothing contained
herein shall be deemed to permit any assignment, transfer or other disposition
of Transfer Restricted Securities in violation of the terms of the Purchase
Agreement or the Indenture. If any transferee of any Holder shall acquire
Transfer Restricted Securities, in any manner, whether by operation of law or
otherwise, such Transfer Restricted Securities shall be held subject to all of
the terms of this Agreement, and by taking and holding such Transfer Restricted
Securities such person shall be conclusively deemed to have agreed to be bound
by and to perform all of the terms and provisions of this Agreement.

     (g) Counterparts. This Agreement may be executed in any number of
counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute one and the same agreement.

     (h) Securities Held by the Company or its' Affiliates. Whenever the consent
or approval of Holders of a specified percentage of Transfer Restricted
Securities is required hereunder, Transfer Restricted Securities held by the
Company or its Affiliates shall not be counted in determining whether such
consent or approval was given by the Holders of such required percentage.

     (i) Headings. The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

     (j) Governing Law. This Agreement shall be governed by, and construed in
accordance with, the law of the State of New York.

     (k) Severability. If any one or more of the provisions contained herein, or
the application thereof in any circumstance, is held invalid, illegal or
unenforceable, the validity,

                         Registration Rights Agreement

<PAGE>

legality and enforceability of any such provision in every other respect and of
the remaining provisions contained herein shall not be affected or impaired
thereby.

     (l) Entire Agreement. This Agreement is intended by the parties as a final
expression of their agreement and intended to be a complete and exclusive
statement of the agreement and understanding of the parties hereto in respect of
the subject matter contained herein. There are no restrictions, promises,
warranties or undertakings, other than those set forth or referred to herein
with respect to the registration rights granted by the Company and the
Guarantors with respect to the Transfer Restricted Securities. This Agreement
supersedes all prior agreements and understandings between the parties with
respect to such subject matter.

                         Registration Rights Agreement
<PAGE>

                  IN WITNESS WHEREOF, the parties have executed this Agreement
as of the date first written above.

                                   L-3 COMMUNICATIONS HOLDINGS, INC.,
                                            as the Company

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                        Name: Christopher C. Cambria
                                        Title:   Vice President

                                   L-3 COMMUNICATIONS CORPORATION,
                                            as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                        Name: Christopher C. Cambria
                                        Title:   Vice President

                                   HYGIENETICS ENVIRONMENTAL SERVICES, INC.,
                                            as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                        Name: Christopher C. Cambria
                                        Title:   Vice President

                                   L-3 COMMUNICATIONS ILEX SYSTEMS, INC.,
                                            as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                        Name: Christopher C. Cambria
                                        Title:   Vice President

                         Registration Rights Agreement
<PAGE>

                                   L-3 COMMUNICATIONS AYDIN CORPORATION,
                                            as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                        Name: Christopher C. Cambria
                                        Title:   Vice President

                                   MPRI, INC.,
                                          as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                        Name: Christopher C. Cambria
                                        Title:   Vice President

                                   L-3 COMMUNICATIONS SPD TECHNOLOGIES, INC.,
                                            as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                        Name: Christopher C. Cambria
                                        Title:   Vice President

                                   SPD HOLDINGS, INC.,
                                            as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                        Name: Christopher C. Cambria
                                        Title:   Vice President

                                   SPD ELECTRICAL SYSTEMS, INC.,
                                            as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                        Name: Christopher C. Cambria
                                        Title:   Vice President

                         Registration Rights Agreement
<PAGE>

                                   SPD SWITCHGEAR, INC.,
                                            as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                        Name: Christopher C. Cambria
                                        Title:   Vice President

                                   PAC ORD, INC.,
                                           as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                        Name: Christopher C. Cambria
                                        Title:   Vice President

                                   HENSCHEL, INC.,
                                            as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                         Name: Christopher C. Cambria
                                         Title:   Vice President

                                    POWER PARAGON, INC.,
                                             as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                         Name: Christopher C. Cambria
                                         Title:   Vice President

                                    L-3 COMMUNICATIONS ESSCO, INC.,
                                             as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                         Name: Christopher C. Cambria
                                         Title:   Vice President

                         Registration Rights Agreement

<PAGE>

                                   SOUTHERN CALIFORNIA MICROWAVE, INC.,
                                             as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                         Name: Christopher C. Cambria
                                         Title:   Vice President

                                 L-3 COMMUNICATIONS STORM CONTROL SYSTEMS, INC.,
                                             as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                         Name: Christopher C. Cambria
                                         Title:   Vice President

                                    L-3 COMMUNICATIONS DBS MICROWAVE, INC.,
                                             as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                         Name: Christopher C. Cambria
                                         Title:   Vice President

                                    MICRODYNE CORPORATION,
                                             as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                         Name: Christopher C. Cambria
                                         Title:   Vice President

                                    ELECTRODYNAMICS, INC.,
                                             as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                         Name: Christopher C. Cambria
                                         Title:   Vice President

                         Registration Rights Agreement

<PAGE>

                                   INTERSTATE ELECTRONICS CORPORATION,
                                             as a Guarantor

                                   By:/s/ Christopher C. Cambria
                                      -----------------------------------
                                        Name: Christopher C. Cambria
                                        Title:   Vice President

                         Registration Rights Agreement
<PAGE>

                  IN WITNESS WHEREOF, the parties have executed this Agreement
as of the date first written above.

                                      LEHMAN BROTHERS INC.

                                      By /s/ David J. Brand
                                         ---------------------------------
                                          NAME: David J. Brand
                                          TITLE: Managing Director

                         Registration Rights Agreement

<PAGE>

                                                                      SCHEDULE 1

                                  NET PROCEEDS

<TABLE>
<CAPTION>

                                                                          PER
                                                                          NOTE              TOTAL
                                                                          ----           ------------
<S>                                                                 <C>                 <C>
   Offering Price....................................................       100%        $250,000,000
   Discounts and Commissions.........................................      2.75%          $6,875,000
   Net Proceeds to the Company (before deducting expenses)...........     97.25%        $243,125,000
</TABLE>

<PAGE>

                                                                       EXHIBIT A

                        L-3 COMMUNICATIONS HOLDINGS, INC.

                        NOTICE OF REGISTRATION STATEMENT

                                       AND

                SELLING SECURITYHOLDER ELECTION AND QUESTIONNAIRE

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

                                     NOTICE

         L-3 Communications Holdings, Inc. (the "Company") has filed, or intends
to file, with the Securities and Exchange Commission (the "Commission") a
registration statement on Form S-3 or such other Form as may be available (the
"Registration Statement"), for the registration and resale under Rule 415 of the
Securities Act of 1933, as amended (the "Securities Act"), of the Company's
5.25% Convertible Senior Subordinated Notes due 2009 (CUSIP No. 502424 AA 2 for
Rule 144A purchasers and CUSIP No. U50219 AC 5 for Reg S purchasers) (the
"Notes"), and common stock, par value $0.01 per share, issuable upon conversion
thereof (the "Shares" and together with the Notes, the "Transfer Restricted
Securities") in accordance with the terms of the Registration Rights Agreement,
dated as of November 21, 2000 (the "Registration Rights Agreement") between the
Company and Lehman Brothers Inc. A copy of the Registration Rights Agreement is
available from the Company upon request at the address set forth below. All
capitalized terms not otherwise defined herein have the meaning ascribed thereto
in the Registration Rights Agreement.

         In order to sell or otherwise dispose of any Transfer Restricted
Securities pursuant to the Registration Statement, a beneficial owner of
Transfer Restricted Securities generally will be required to be named as a
selling securityholder in the related Prospectus, deliver a Prospectus to
purchasers of Transfer Restricted Securities, be subject to certain civil
liability provisions of the Securities Act and be bound by those provisions of
the Registration Rights Agreement applicable to such beneficial owner (including
certain indemnification rights and obligations, as described below). In order to
be included in the Registration Statement, this Election and Questionnaire must
be completed, executed and delivered to the Company at the address set forth
herein for receipt PRIOR TO OR ON [insert here date that is 20 business days
from the date of this notice] (the "Election and Questionnaire Deadline").
BENEFICIAL OWNERS THAT DO NOT COMPLETE THIS NOTICE AND QUESTIONNAIRE PRIOR TO
THE ELECTION AND QUESTIONNAIRE DEADLINE AND DELIVER IT TO THE COMPANY AS
PROVIDED BELOW WILL NOT BE NAMED AS SELLING SECURITYHOLDERS IN THE PROSPECTUS
AND THEREFORE WILL NOT BE PERMITTED TO SELL ANY TRANSFER RESTRICTED SECURITIES
PURSUANT TO THE REGISTRATION STATEMENT.

         Certain legal consequences arise from being named as a selling
securityholder in the Registration Statement and the related Prospectus.
Accordingly, holders and beneficial owners of Transfer Restricted Securities are
advised to consult their own securities law counsel

                                      A-1
<PAGE>

regarding the consequences of being named or not being named as a selling
securityholder in the Registration Statement and the related Prospectus.

                                    ELECTION

         The undersigned Holder (the "Selling Securityholder") of Transfer
Restricted Securities hereby elects to include in the Registration Statement the
Transfer Restricted Securities beneficially owned by it and listed below in Item
3 (unless otherwise specified under Item 3) pursuant to the Registration
Statement. The undersigned, by signing and returning this Election and
Questionnaire, understands that it will be bound by the terms and conditions of
this Election and Questionnaire and the Registration Rights Agreement.

         Pursuant to the Registration Rights Agreement, the Selling
Securityholder has agreed to indemnify and hold harmless the Company, the
Company's directors, the Company's officers who sign the Registration Statement
and each person, if any, who controls the Company within the meaning of either
Section 15 of the Securities Act or Section 20 of the Exchange Act, from and
against certain losses arising in connection with statements concerning the
Selling Securityholder made in the Registration Statement or the related
Prospectus in reliance upon the information provided in this Election and
Questionnaire.

         The Selling Securityholder hereby provides the following information to
the Company and represents and warrants that such information is accurate and
complete:

                                  QUESTIONNAIRE

1.       (a)      Full legal name of Selling Securityholder:

         (b)      Full legal name of registered holder (if not the same as (a)
                  above) through which Transfer Restricted Securities listed in
                  (3) below are held:

         (c)      Full legal name of DTC participant (if applicable and if not
                  the same as (b) above) through which Transfer Restricted
                  Securities listed in (3) are held:

2.       Address for notices to Selling Securityholders:

         Telephone:

         Fax:

         Contact Person:

3.       Beneficial ownership of Transfer Restricted Securities:

         (a)      Type of Transfer Restricted Securities beneficially owned, and
                  principal amount of Notes or number of shares of Common Stock,
                  as the case may be, beneficially owned:

                                      A-2
<PAGE>

         (b)      CUSIP No(s). of such Transfer Restricted Securities
                  beneficially owned:

4.       Beneficial ownership of the Company's securities owned by the Selling
         Securityholder:

         Except as set forth below in this Item (4), the undersigned is not the
         beneficial or registered owner of any securities of the Company other
         than the Transfer Restricted Securities listed above in Item (3)
         ("Other Securities").

         (a)      Type and amount of Other Securities beneficially owned by the
                  Selling Securityholder:

         (b)      CUSIP No(s). of such Other Securities beneficially owned:

5.       Relationship with the Company

         Except as set forth below, neither the undersigned nor any of its
         affiliates, officers, directors or principal equity holders (5% or
         more) has held any position or office or has had any other material
         relationship with the Company (or their predecessors or affiliates)
         during the past three years.

         State any exceptions here:

6.       Plan of Distribution

         Except as set forth below, the undersigned (including its donees or
         pledgees) intends to distribute the Transfer Restricted Securities
         listed above in Item (3) pursuant to the Registration Statement only as
         follows (if at all). Such Transfer Restricted Securities may be sold
         from time to time directly by the undersigned or, alternatively,
         through underwriters, broker-dealers or agents. If the Transfer
         Restricted Securities are sold through underwriters or broker-dealers,
         the Selling Securityholder will be responsible for underwriting
         discounts or commissions or agent's commissions. Such Transfer
         Restricted Securities may be sold in one or more transactions at fixed
         prices, at prevailing market prices at the time of sale, at varying
         prices determined at the time of sale, or at negotiated prices. Such
         sales may be effected in transactions (which may involve crosses or
         block transactions):

         (i) on any national securities exchange or quotation service on which
         the Transfer Restricted Securities may be listed or quoted at the time
         of sale;

                                      A-3
<PAGE>

         (ii)     in the over-the-counter market;

         (iii) in transactions otherwise than on such exchanges or services or
         in the over-the-counter market; or

         (iv)     through the writing of options.

         In connection with sales of the Transfer Restricted Securities or
         otherwise, the undersigned may enter into hedging transactions with
         broker-dealers, which may in turn engage in short sales of the Transfer
         Restricted Securities and deliver Transfer Restricted Securities to
         close out such short positions, or loan or pledge Transfer Restricted
         Securities to broker-dealers that in turn may sell such securities.

         State any exceptions here:

         NOTE: IN NO EVENT WILL SUCH METHOD(S) OF DISTRIBUTION TAKE THE FORM OF
AN UNDERWRITTEN OFFERING OF THE TRANSFER RESTRICTED SECURITIES WITHOUT THE PRIOR
AGREEMENT OF THE COMPANY.

         By signing below, the Selling Securityholder acknowledges that it
understands its obligation to comply, and agrees it will comply, with the
provisions of the prospectus delivery and other provisions of the Securities Act
and the Exchange Act and the respective rules and regulations promulgated
thereunder, particularly Regulation M thereunder (or any successor rules or
regulations), in connection with any offering of Transfer Restricted Securities
pursuant to the Registration Statement.

         If the Selling Securityholder transfers all or any portion of the
Transfer Restricted Securities listed in Item 3 above after the date on which
such information is provided to the Company, the Selling Securityholder agrees
to notify the transferee(s) at the time of the transfer of its rights and
obligations under this Election and Questionnaire and the Registration Rights
Agreement.

         By signing below, the undersigned consents to the disclosure of the
information contained herein in its answers to items (1) through (6) above and
the inclusion of such information in the Registration Statement and the related
Prospectus. The undersigned understands that such information will be relied
upon by the Company in connection with the preparation or amendment of the
Registration Statement and the related Prospectus.

         In accordance with the Selling Securityholder's obligation under the
Registration Rights Agreement to provide such information as may be required by
law for inclusion in the Registration Statement, the Selling Securityholder
agrees to promptly notify the Company of any inaccuracies or changes in the
information provided herein that may occur subsequent to the date hereof at any
time while the Registration Statement remains effective. All notices hereunder
and pursuant to the Registration Rights Agreement shall be made in writing at
the address set forth below.

                                      A-4
<PAGE>

         Once this Election and Questionnaire is executed by the Selling
Securityholder and received by the Company, the terms of this Election and
Questionnaire and the representations and warranties contained herein shall be
binding on, shall inure to the benefit of and shall be enforceable by the
respective successors, heirs, personal representatives and assigns of the
Company and the Selling Securityholder with respect to the Transfer Restricted
Securities beneficially owned by such Selling Securityholder and listed in Item
3 above. This Agreement shall be governed by, and construed in accordance with,
the laws of the State of New York.

                                      A-5
<PAGE>

         IN WITNESS WHEREOF, the undersigned, by authority duly given, has
caused this Election and Questionnaire to be executed and delivered either in
person or by its duly authorized agent.

Dated:

Beneficial Owner

By:___________________________________
   Name:
   Title:

Please return the completed and executed Election and Questionnaire for receipt
prior to or on deadline for response to L-3 Communications Holdings, Inc. at:

                  L-3 Communications Holdings, Inc.
                  600 Third Avenue
                  New York, New York  10016
                  Attn:  Chris Cambria, Esq. General Counsel and Vice President

                                      A-6
<PAGE>

                                                            EXHIBIT 1 TO ANNEX A

                           NOTICE OF TRANSFER PURSUANT
                            TO REGISTRATION STATEMENT

L-3 Communications Holdings, Inc.
600 Third Avenue
New York, New York  10016
Attn:  Chris Cambria

First Chicago Trust Company of New York
Mall Suite 4691
P.O. Box 2536
Jersey City, New Jersey 07303-2536
Attn:  George McIntyre
Tel.     (201) 222-4115
Fax      (201) 222-4679

          Re: L-3 Communications Holdings, Inc.'s 5.25% Convertible Senior
                  Subordinated Notes due 2009 (the "Notes")

Dear Sirs:

          Please be advised that                  has transferred $
aggregate principal amount of the above-referenced Notes or       shares of
the Company's Common Stock issued on conversion or repurchase of Notes,
pursuant to the Registration Statement on
Form S-3 (File No. 333-        ) filed by the Company.

          We hereby certify that the prospectus delivery requirements, if any,
of the Securities Act of 1933, as amended, have been satisfied with respect to
the transfer described above and that the above named beneficial owner of the
Notes or Common Stock is named as a selling securityholder in the Prospectus
dated                       , or in amendments or supplements thereto, and that
the aggregate principal amount of the Notes or number of shares of Common Stock
 transferred
are [all or a portion of] the Notes or Common Stock listed in such Prospectus,
as amended or supplemented, opposite such owner's name.

                                     Very truly yours,

                                     [name]
                                     By:_______________________________________
                                                (Authorized signature)

Dated: _____________________________

                                      A-7

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