Filed Pursuant to Rule 424(b)(3) Registration File No.: 333-75558 PROSPECTUS SUPPLEMENT (TO PROSPECTUS DATED JANUARY 4, 2002) $420,000,000 [L-3 COMMUNICATIONS GRAPHIC OMITTED] L-3 COMMUNICATIONS HOLDINGS, INC. 4.00% SENIOR SUBORDINATED CONVERTIBLE CONTINGENT DEBT SECURITIESSM (CODESSM) DUE 2011 AND 3,902,439 SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION OF THE CODES GUARANTEED BY L-3 Communications Corporation L-3 Communications SPD Technologies, Inc. Coleman Research Corporation L-3 Communications Storm Control Systems, Inc. EER Systems, Inc. KDI Precision Products, Inc. Electrodynamics, Inc. Microdyne Corporation Henschel, Inc. MPRI, Inc. Hygienetics Environmental Services, Inc. Pac Ord, Inc. Interstate Electronics Corporation Power Paragon, Inc. L-3 Communications Aydin Corporation Southern California Microwave, Inc. L-3 Communications DBS Microwave, Inc. SPD Holdings, Inc. L-3 Communications ESSCO, Inc. SPD Electrical Systems, Inc. L-3 Communications ILEX Systems, Inc. SPD Switchgear, Inc. - -------------------------------------------------------------------------------- This prospectus supplement relates to: - -- $420,000,000 in aggregate principal amount of 4.00% Senior Subordinated Convertible Contingent Debt SecuritiesSM (CODESSM) due 2011; - -- The shares of our common stock issuable upon conversion of the CODES; and - -- The subsidiary guarantees of the CODES on behalf of each of our subsidiary guarantors. This prospectus supplement, which supplements our prospectus dated January 4, 2002, contains information about the selling security holders. NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS PROSPECTUS SUPPLEMENT IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE. "Convertible Contingent Debt Securities" and "CODES" are service marks of Lehman Brothers Inc. July 29, 2002
TABLE OF CONTENTS PAGE ----- Selling Securityholders ......................................... S-2 You should rely only on the information contained in this prospectus supplement and the prospectus to which it refers. We have not authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. We are not making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus supplement and the prospectus to which it refers is accurate only as of their respective dates. i
SELLING SECURITYHOLDERS The selling holders are offering CODES and shares of common stock issuable upon conversion of the CODES under this prospectus supplement pursuant to existing registration rights conferred by the Registration Rights Agreement dated as of October 24, 2001 among L-3 Holdings, the Guarantors named therein and Lehman Brothers Inc., Bear, Stearns & Co., Inc. and Credit Suisse First Boston Corporation, as initial purchasers. The following table sets forth information, as of July 26, 2002, with respect to the selling holders and the principal amounts of CODES and number of shares of common stock into which the CODES are convertible beneficially owned by each selling holder that may be offered under this prospectus. The information is based on information provided by or on behalf of the selling holders. The selling holders may offer all, some or none of the CODES or common stock into which the CODES are convertible. Because the selling holders may offer all or some portion of the CODES or the common stock, no estimate can be given as to the amount of the CODES or the common stock that will be held by the selling holders upon termination of any sales. In addition, the selling holders identified below may have sold, transferred or otherwise disposed of all or a portion of their CODES in transactions exempt from the registration requirements of the Securities Act or pursuant to our Registration Statement on Form S-3 and amendments or supplements thereto. Selling holders, including their transferees, pledgees or donees or their successors, may from time to time offer and sell pursuant to this prospectus any or all of the CODES and common stock into which the CODES are convertible. Identification of any additional selling holders, if any, who exercise their registration rights, pursuant to the registration rights agreement mentioned above, will be made in the applicable prospectus supplement. SHARES OF COMMON STOCK PRINCIPAL AMOUNT PERCENTAGE OF ISSUABLE UPON OF CODES BENEFICIALLY OUTSTANDING CONVERSION OF NAME OWNED CODES OWNED THE CODES - ------------------------------------------------------- ----------------------- --------------- -------------- AIG/National Union Fire Insurance ..................... $ 750,000 0.18% 6,968 Akela Capital Master Fund, Ltd. ....................... $ 1,000,000 0.24% 9,291 Allstate Insurance Company ............................ $ 1,850,000 0.44% 17,189 Allstate Life Insurance Company ....................... $ 650,000 0.15% 6,039 Amaranth LLC .......................................... $ 1,500,000 0.36% 13,937 American Samoa Government ............................. $ 51,000 0.01% 473 Arbitex Master Fund L.P. .............................. $26,000,000 6.19% 241,566 Argent Classic Convertible Arbitrage Fund (Bermuda) Ltd. .............................. $ 4,000,000 0.95% 37,166 Argent LowLev Convertible Arbitrage Fund Ltd. ......... $ 1,000,000 0.24% 9,291 Arkansas PERS ......................................... $ 650,000 0.15% 6,039 Attorney's Title Insurance Fund Inc. .................. $ 200,000 0.05% 1,858 BMO Nesbitt Burns Inc. ................................ $ 5,500,000 1.31% 51,103 BP Amoco PLC Master Trust ............................. $ 1,498,000 0.36% 13,918 BT Equity Opportunity ................................. $ 750,000 0.18% 6,968 BTES--Convertible ARB ................................. $ 750,000 0.18% 6,968 BTPO Growth vs. Value ................................. $ 2,000,000 0.48% 18,583 Bancroft Convertible Fund, Inc. ....................... $ 1,000,000 0.24% 9,291 Bay County PERS ....................................... $ 165,000 0.04% 1,533 Black Diamond Capital I, Ltd. ......................... $ 537,000 0.13% 4,989 Black Diamond Convertible Offshore LDC ................ $ 908,000 0.22% 8,436 Black Diamond Offshore Ltd. ........................... $ 1,640,000 0.39% 15,238 Boilermakers Blacksmith Pension Trust ................. $ 800,000 0.19% 7,433 CALAMOS (Registered Trademark) Market Neutral Fund CALAMOS (Registered Trademark) Investment Trust ..... $10,000,000 2.38% 92,915 CFFX, LLC ............................................. $ 2,500,000 0.60% 23,228 Chrysler Corporation Master Retirement Trust .......... $ 5,490,000 1.31% 51,010 Clinton Multistrategy Master Fund, Ltd. ............... $ 6,500,000 1.55% 60,394 Clinton Riverside Convertible Portfolio Limited ....... $ 9,500,000 2.26% 88,269 Consulting Group Capital Markets Funds ................ $ 500,000 0.12% 4,645 Convertible Securities Fund ........................... $ 200,000 0.05% 1,858 D.F. Shaw Investments, L.P. ........................... $ 500,000 0.12% 4,645 D.F. Shaw Valence, L.P. ............................... $ 2,000,000 0.48% 18,583 Daimler Chrysler Corp Emp #1 Pension Plan DTO 4/1/89 ............................................... $ 3,140,000 0.75% 29,175 Deephaven Domestic Convertible Trading, Ltd............ $ 5,500,000 1.31% 51,103 Deeprock & Co. ........................................ $ 2,300,000 0.55% 21,370 Delaware PERS ......................................... $ 925,000 0.22% 8,594 Delta Air Lines Master Trust .......................... $ 1,465,000 0.35% 13,612 Delta Pilots D&S Trust ................................ $ 740,000 0.18% 6,875 Deutsche Banc Alex. Brown Inc. ........................ $51,250,000 12.20% 476,190 Deutsche Bank AG London ............................... $ 5,000,000 1.19% 46,457 S-2
SHARES OF COMMON STOCK PRINCIPAL AMOUNT PERCENTAGE OF ISSUABLE UPON OF CODES BENEFICIALLY OUTSTANDING CONVERSION OF NAME OWNED CODES OWNED THE CODES - ---------------------------------------------------- ----------------------- --------------- -------------- Double Black Diamond Offshore LDC .................. $ 8,447,000 2.01% 78,485 Duke Endowment ..................................... $ 325,000 0.08% 3,019 Ellsworth Convertible Growth and Income Fund, Inc. .............................................. $ 1,000,000 0.24% 9,291 Equity & Convertibles Fund ......................... $ 1,500,000 0.36% 13,937 Equity Income Fund ................................. $ 200,000 0.05% 1,858 The Estate of James Campbell ....................... $ 160,000 0.04% 1,486 F.R. Convt. Sec. Fn. ............................... $ 70,000 0.02% 650 Family Service Life Insurance Co. .................. $ 200,000 0.05% 1,858 Fidelity Financial Trust: Fidelity Convertible Securities Fund ................................... $ 2,000,000 0.48% 18,583 Fidelity Commonwealth Trust: Fidelity Mid-Cap Stock Fund ........................................ $30,000,000 7.14% 278,745 First Union International Capital Markets Inc. ..... $12,500,000 2.98% 116,144 First Union National Bank .......................... $42,500,000 10.12% 394,889 First Union Securities Inc. ........................ $ 750,000 0.18% 6,968 Forest Alternative Strategies II ................... $ 105,000 0.03% 975 Forest Fulcrum Fund L.L.P. ......................... $ 1,470,000 0.35% 13,658 Forest Global Convertible Fund Series A5 ........... $ 6,272,000 1.49% 58,276 Franklin and Marshall College ...................... $ 180,000 0.04% 1,672 GDO Equity Artbitrage Master Fund .................. $ 5,000,000 1.19% 46,457 GLG Global Convertible Fund ........................ $ 7,100,000 1.69% 65,969 GLG Global Convertible UCITS Fund .................. $ 400,000 0.10% 3,716 GLG Market Neutral Fund ............................ $ 7,500,000 1.79% 69,686 GM Employees Global GRP Pen Tr. (ABS Return Portfolio) ........................................ $ 1,600,000 0.38% 14,866 Goldman Sachs & Company ............................ $ 250,000 0.06% 2,322 Granville Capital Corporation ...................... $ 8,000,000 1.90% 74,332 Guardian Life Insurance Co. ........................ $ 9,200,000 2.19% 85,481 Guardian Pension Trust ............................. $ 500,000 0.12% 4,645 HBK Master Fund L.P. ............................... $ 7,500,000 1.79% 69,686 HFR Master Fund .................................... $ 50,000 0.01% 464 Highbridge International LLC ....................... $20,000,000 4.76% 185,830 Hotel Union & Hotel Industry of Hawaii ............. $ 270,000 0.06% 2,508 ICI American Holdings Trust ........................ $ 275,000 0.07% 2,555 JWF High Yield Fund ................................ $ 3,750,000 0.89% 34,843 James Campbell Corporation ......................... $ 210,000 0.05% 1,951 Janus High Yield ................................... $ 5,000,000 1.19% 46,457 Jeffries & Company Inc. ............................ $ 6,000 -- 55 Julius Baer Multibond Convertbond .................. $ 500,000 0.12% 4,645 KBC Financial Products (Cayman Islands) ............ $ 2,500,000 0.60% 23,228 LLT Limited ........................................ $ 430,000 0.10% 3,995 Lehman Brothers Inc. ............................... $ 6,000,000 1.42% 55,749 Lipper Convertibles, L.P. .......................... $17,750,000 4.23% 164,294 Lipper Offshore Convertibles, L.P. ................. $17,750,000 4.23% 164,294 Lyxor Master Fund c/o Forest Investment Management L.L.C. ................................. $ 800,000 0.19% 7,433 Microsoft Corporation .............................. $ 1,795,000 0.43% 16,678 Motion Picture Industry Health Plan -- Active Member Fund ....................................... $ 505,000 0.12% 4,692 Motion Picture Industry Health Plan -- Retiree Member Fund ....................................... $ 215,000 0.05% 1,997 Nations Convertible Securities Fund ................ $ 6,500,000 1.55% 60,394 Nations Equity Income Fund ......................... $ 2,040,000 0.49% 18,954 OCM Convertible Trust .............................. $ 3,330,000 0.79% 30,940 OXA Trade & Finance Inc. ........................... $ 200,000 0.05% 1,858 Ondeo Nalco ........................................ $ 190,000 0.04% 1,765 Onex Industrial Partners Limited ................... $ 3,770,000 0.90% 35,029 PIMCO Convertible Fund ............................. $ 800,000 0.19% 7,433 Paloma Securities LLC .............................. $42,500,000 10.12% 394,889 Park Avenue Life Insurance Co. ..................... $ 100,000 0.02% 929 S-3
SHARES OF COMMON STOCK PRINCIPAL AMOUNT PERCENTAGE OF ISSUABLE UPON OF CODES BENEFICIALLY OUTSTANDING CONVERSION OF NAME OWNED CODES OWNED THE CODES - ---------------------------------------------------- ----------------------- --------------- -------------- Partner Reinsurance Company Ltd. ................... $ 880,000 0.21% 8,176 Pebble Capital Inc. ................................ $ 2,060,000 0.49% 19,140 Peoples Benefit Life Insurance Company TEAMSTERS ......................................... $ 6,900,000 1.64% 64,111 Pogue Capital International Ltd. ................... $ 300,000 0.07% 2,787 Qwest Occupational Health Trust .................... $ 200,000 0.05% 1,858 RBC Capital Services Inc. c/o Forest Investment Management L.L.C. ................................. $ 43,000 0.01% 399 Retail Clerks Pension #2 ........................... $ 2,300,000 0.55% 21,370 Royal Bank of Canada ............................... $ 2,000,000 0.48% 18,583 SG Hambros Trust Company (Jersey) Ltd. as Trustee of the Lyxor Master Fund .................. $ 500,000 0.12% 4,645 Sage Capital ....................................... $ 2,000,000 0.48% 18,583 St. Albans Partners Ltd. ........................... $ 6,900,000 1.64% 64,111 Salomon Brothers Asset Management .................. $13,000,000 3.10% 120,789 Silverado Arbitrage Trading, LTD ................... $ 1,000,000 0.24% 9,291 Silvercreek II Limited ............................. $ 7,570,000 1.80% 70,336 Silvercreek Limited Partnership .................... $ 2,600,000 0.62% 24,157 Starvest Combined Portfolio ........................ $ 475,000 0.11% 4,413 State Employees' Retirement Fund of the State of Delaware .......................................... $ 2,185,000 0.52% 20,301 State of Connecticut Combined Investment Funds...... $ 4,595,000 1.09% 42,694 State of Oregon -- Equity .......................... $ 2,925,000 0.70% 27,177 State Street Custodian for GE Pension Trust ........ $ 1,440,000 0.34% 13,379 Sylvan (IMA) Ltd. c/o Forest Investment Management L.L.C. ................................. $ 610,000 0.15% 5,667 Syngenta AG ........................................ $ 150,000 0.04% 1,393 Transamerica Insurance Co. of Iowa ................. $ 5,000,000 1.19% 46,457 Transamerica Occidental Life ....................... $ 5,000,000 1.19% 46,457 UBS O'Connor LLC F/B/O UBS Global Convertible Fund .................................. $ 250,000 0.06% 2,322 Viacom Inc. Pension Plan Master Trust .............. $ 24,000 -- 222 Worldwide Transactions Ltd. ........................ $ 468,000 0.11% 4,348 WPG Convertible Arbitrage Overseas Master Fund, L.P. ........................................ $ 750,000 0.18% 6,968 Wells Fargo & Company ............................... $ 2,000,000 0.48% 18,583 Zeneca Holdings Trust .............................. $ 225,000 0.05% 2,090 Zurich Institutional Benchmarks .................... $ 281,000 0.07% 2,610 Zurich Master Hedge Fund c/o Forest Investment Management L.L.C. ................................. $ 270,000 0.06% 2,508 S-4