EXHIBIT 21 Subsidiaries of the Registrant As of March 22, 1996, the following is a list of the parent (Registrant) and its subsidiaries, together with their subsidiaries. Except as noted, all voting securities of the listed subsidiaries are 100% beneficially owned by the Registrant or a subsidiary thereof. State or Country Number of Incorporation of Name of Company or Organization Parent - ------------------------------------------------------------------------------------------------ 1 EG&G, Inc. Massachusetts N/A 2 EG&G Alabama, Inc. Alabama 1 3 EG&G Aluminum, Inc. Delaware 33 4 EG&G Astrophysics Research Corporation California 1 5 EG&G Automotive Research, Inc. Texas 22 6 EG&G Birtcher, Inc. California 33 7 EG&G Benelux B.V. Netherlands 73 (77%) 1 (23%) 8 EG&G Canada Investments, Inc. Canada 86 9 EG&G Canada Limited Canada 1 (10%) 28 (43.5%) 38(46.5%) 10 EG&G Chandler Engineering Company Oklahoma 1 11 EG&G Defense Materials, Inc. Utah 1 12 EG&G do Brasil Ltda. Brazil 22 (95%) 85 (5%) 13 EG&G Dynatrend, Inc. Delaware 1 14 EG&G E.C. Bahrain 22 15 EG&G Energy Measurements, Inc. Nevada 1 16 EG&G Environmental, Inc. Delaware 1 17 EG&G Exporters Ltd. U.S. Virgin Islands 22 18 EG&G Florida, Inc. Florida 1 19 EG&G Flow Technology, Inc. Arizona 1 20 EG&G Gamma Scientific, Incorporated Delaware 22 21 EG&G GmbH Germany 22 22 EG&G Holdings, Inc. Massachusetts 1 (87%) 24 ( 6%) 71 (5%) 10(2%) 23 EG&G Idaho, Inc. Idaho 22 24 EG&G Instruments, Inc. Delaware 22 25 EG&G Instruments GmbH Germany 1 26 EG&G International, Ltd. Cayman Islands 22 27 EG&G Japan, Inc. Delaware 22 28 EG&G Judson Infrared, Inc. Pennsylvania 1 29 EG&G KT Aerofab, Inc. California 22 30 EG&G Langley, Inc. Virginia 18 31 EG&G Ltd. United Kingdom 22 (80.9%) 4 (19.1%) 32 EG&G Management Systems, Inc. New Mexico 1 33 EG&G Metals, Inc. Massachusetts 1 34 EG&G Missouri Metal Shaping Company Missouri 22 35 EG&G Mound Applied Technologies, Inc. Ohio 1 36 EG&G Omni, Inc. Philippines 22 37 EG&G Power Systems, Inc. California 1 38 EG&G Pressure Science Incorporated Maryland 22 39 EG&G Rocky Flats, Inc. Colorado 1 40 EG&G Sealol Eagle, Inc. Delaware 42 (51%) 41 EG&G Sealol Ltd. (Sealol Egypt) Egypt 22 (22%) 26 (78%) 42 EG&G Sealol, Inc. Delaware 22 43 EG&G Services, Inc. Delaware 1 44 EG&G Special Projects, Inc. Nevada 1 45 EG&G Star City, Inc. Ohio 2 46 EG&G Structural Kinematics, Inc. Michigan 1 47 EG&G S.A. France 26 48 EG&G SpA Italy 22 49 EG&G Technical Services West Virginia 51 of West Virginia, Inc. 50 EG&G Ventures, Inc. Massachusetts 1 51 EG&G Washington Analytical District of Columbia 1 Services Center, Inc. 52 EG&G Watertown, Inc. Massachusetts 73 53 Antarctic Support Associates (Partnership) Colorado 1 (40%) 54 Benelux Analytical Instruments S.A. Belgium 1 (92.3%) 55 Berthold Analytical Instruments, Inc. Delaware 1 56 Berthold A.G. Switzerland 58 57 Berthold France S.A. France 47 58 Berthold GmbH Germany 1 59 Berthold Munchen GmbH Germany 67 (60%) 60 Biozone Oy Finland 83 61 B.A.I. GmbH Austria 58 62 Eagle EG&G Aerospace Co. Ltd. Japan 1 (49%) 63 EC III, Inc. New Mexico 1 (50%) 64 Heimann Optoelectronics GmbH Germany 67 65 Heimann Shenzhen Optoelectronics Co. Ltd. China 64 (90%) 66 IC Sensors, Inc. California 1 67 Laboratorium Prof. Dr. Rudolf Germany 21 (58.0%) 25 (2.3%) 5(39.7%) Berthold GmbH & Co. KG 68 NOK EG&G Optoelectronics Corporation Japan 1 (49%) 69 Pribori Oy Finland 83 70 PT EG&G Heimann Optoelectronics Indonesia 22 71 Reticon Corporation California 1 72 Reynolds Electrical & Engineering Co., Inc. Texas 1 73 Rotron Incorporated New York 1 74 Science Support Corporation Delaware 1 75 Sealol Hindustan Limited India 42 (20%) 76 Sealol S.A. Venezuela 42 77 Seiko EG&G Co. Ltd. Japan 1 (49%) 78 Shanghai EG&G Reticon China 71 (50%) Optoelectronics Co. Ltd 79 Societe Civile Immobiliere France 1 (82.5%) 57 (17.5%) 80 Vactec, Inc. Missouri 1 81 WALLAC A/S Denmark 83 82 WALLAC Norge AS Norway 83 83 WALLAC Oy Finland 22 84 WALLAC Sverige AB Sweden 83 85 WALLAC, Inc. Maryland 1 86 Wellesley B.V. Netherlands 87 87 Wickford N.V. Netherlands Antillies 26 88 Wright Components, Inc. New York 1 89 ZAO Pribori Russia 69