A/B EXCHANGE
                          REGISTRATION RIGHTS AGREEMENT


                          Dated as of November 12, 2004

                                  by and among


                         L-3 COMMUNICATIONS CORPORATION

               THE GUARANTORS LISTED ON THE SIGNATURE PAGES HERETO

                                       AND

                              LEHMAN BROTHERS INC.
                         CREDIT SUISSE FIRST BOSTON LLC
                         BANC OF AMERICA SECURITIES LLC
                        MORGAN STANLEY & CO. INCORPORATED
                           SG AMERICAS SECURITIES, LLC
                                       AND
                          WACHOVIA CAPITAL MARKETS, LLC











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                   A/B EXCHANGE REGISTRATION RIGHTS AGREEMENT

     This Registration Rights Agreement (this "Agreement") is made and entered
into as of November 12, 2004 by and among L-3 Communications Corporation, a
Delaware corporation (the "Company") the guarantors listed on the signature
pages hereto (collectively, the "Existing Guarantors"), and Lehman Brothers
Inc., Credit Suisse First Boston LLC, Banc of America Securities LLC, Morgan
Stanley & Co. Incorporated, SG Americas Securities, LLC and Wachovia Capital
Markets, LLC, as representatives of the several initial purchasers (the "Initial
Purchasers") named in Schedule 1 to the Purchase Agreement (as defined below),
each of whom has agreed to purchase the Company's 5 7/8% Senior Subordinated
Notes due 2015 (the "Series A Notes") pursuant to the Purchase Agreement (as
defined below).

     This Agreement is made pursuant to the Purchase Agreement, dated as of
November 1, 2004 (the "Purchase Agreement"), by and among the Company, the
Existing Guarantors and the Initial Purchasers. In order to induce the Initial
Purchasers to purchase the Series A Notes, the Company and the Existing
Guarantors have agreed to provide the registration rights set forth in this
Agreement. The execution and delivery of this Agreement is a condition to the
obligations of the Initial Purchasers set forth in Section 3 of the Purchase
Agreement.

     The parties hereby agree as follows:

SECTION 1 DEFINITIONS

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

     Act: The Securities Act of 1933, as amended.

     Additional Guarantor: Any subsidiary of the Company that executes a
Subsidiary Guarantee under the Indenture after the date of this Agreement.

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

     Closing Date: The date of this Agreement.

     Commission: The Securities and Exchange Commission.

     Consummate: A Registered Exchange Offer shall be deemed "Consummated" for
purposes of this Agreement upon the occurrence of (i) the filing and
effectiveness under the Act of the Exchange Offer Registration Statement
relating to the Series B Notes to be issued in the Exchange Offer, (ii) the
maintenance of such Registration Statement continuously effective and the
keeping of the Exchange Offer open for a period not less than the minimum period
required pursuant to Section 3(b) hereof and (iii) the delivery by the Company
to the Registrar under the Indenture of Series B Notes in the same aggregate
principal amount as the aggregate principal amount of Series A Notes that were
tendered by Holders thereof pursuant to the Exchange Offer.

     Damages Payment Date: With respect to the Series A Notes, each Interest
Payment Date.

     Effectiveness Target Date: As defined in Section 5.

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




     Exchange Offer: The registration by the Company under the Act of the Series
B Notes (including the Subsidiary Guarantees) pursuant to a Registration
Statement pursuant to which the Company offers the Holders of all outstanding
Transfer Restricted Securities the opportunity to exchange all such outstanding
Transfer Restricted Securities held by such Holders for Series B Notes and
registered Subsidiary Guarantees in an aggregate principal amount equal to the
aggregate principal amount of the Transfer Restricted Securities tendered in
such exchange offer by such Holders.

     Exchange Offer Registration Statement: The Registration Statement relating
to the Exchange Offer, including the related Prospectus.

     Exempt Resales: The transactions in which the Initial Purchasers propose to
sell the Series A Notes to (i) certain "qualified institutional buyers," as such
term is defined in Rule 144A under the Act, (ii) to certain institutional
"accredited investors," as such term is defined in Rule 501(a)(1), (2), (3) and
(7) under the Act ("Accredited Institutions") and (iii) 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 Act.

     Guarantors: The Additional Guarantors and the Existing Guarantors.

     Holders: As defined in Section 2 hereof.

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

     Initial Purchasers: As defined in the preamble hereto.

     Interest Payment Date: As defined in the Notes.

     NASD: National Association of Securities Dealers, Inc.

     Notes: The Series A Notes and the Series B Notes.

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