| A.A.R. | E.C.I. | Key Instruments |
|---|---|---|
| ACF Industries | Edison | Kidde |
| ACF Electronics | Edo-Aire | King |
| AC Spark Plug | Eldec | Klearflex |
| Aeritalia | Electric Cyro Corp. | Kollsman |
| Aeromarine | Electronic Assistance Corp. | Kratos |
| Aeromechanism | Electronic Resources | K.S. Avionics |
| Aerometrics | Elliot Flight Automation Limited | Labem |
| Aeronetics | Emerson Electric | Lear Siegler |
| Aerosonic | EMP Electronics | Lewis Engineering Co. |
| Aerosonic Navigation Systems | ERCO | Liquidometer |
| Aerotec | E-Systems | Litton |
| A.I.D. | Farem | Lockheed |
| A.I.M. | Farwest | LTV Aerospace |
| Airesearch | Ferranti | Macleod |
| Alcal | Flexable Shaft | Manning, Maxwell & Moore |
| Alcor | Flight-Tronics | Marconi |
| Anadex | Ford | Maxon |
| Applied Technology | Foxboro | McDonnell Aircraft |
| A.R.C. | Friden | Mechanical Products |
| Astek | Garwin | Metron |
| Astronautics | Gauting | Mitchell |
| Auto-lite | General Aero | Monitair |
| Autonetics | General Design | Moog |
| Avien | General Dynamics | Narco |
| Avion | General Electric | National Waterlift |
| Avtech | General Motors | Norden |
| Barber-Coleman | General Nucleonics | Normal-Air |
| Barfield | General Prescision | Northrop |
| Bell Helicopter | General Time | Parker-Hannifin |
| Bendix/Pioneer | Giannini | Penn Airborne Products |
| Bill Jack Scientific Inst. Co. | Gilmore Industries | Penn Keystone |
| Boehme | Globe Industries | Phaostron |
| Boeing | Grimes | Philips Electronics |
| Borg | Guidance Technology | Pratt & Whitney |
| Boston Auto Gauge | Gull Airborne | Radar Relay |
| Bourns | Hamilton Standard | Ragen Data |
| Brittain | Hansen-Lynn | Rainier |
| Brodie | Hazeltine | Ranco |
| Burton | Hickok | R.C.A. |
| Cessna | Hoffman | R.C. Allen |
| Clifton Prescision | Hoke | Revere Corp. |
| Collins | Honeywell | Revue Thommen |
| Com-Air | Howell | R.E. White & Associates |
| Condor | Humphrey | Robert Shaw |
| Conrac Corp. | I.E.E. | Rogers |
| Consolidated Airborne | Industrial Corp. | Rosemount |
| Consolidated Instrrument co. | I.S.C./Telephonics | Sanders Associates |
| Continental Enterprises | Insco | Sangamo Electric |
| Control Engineering Corp. | Instruments Inc. | Schwien |
| Controlotron Corp. | Itek | Scintilla |
| Cook Electric | Intercontinerntal Dynamics Corp. | Servo Development Corp. |
| Courter | I.T.T. | Servo Mechanisms |
| Curtiss-Wright | Jack & Heintz | Sfena |
| Dare Inc. | Jaeger | Sierra Research |
| Dejur-Amsco | J.E.T. | Sikorsky |
| Detroit Controls | John Oster | Simmons |
| Diehl | Johnson | Small Motors |
| Digitac | J-Tek | Space Corp. |
| Dorne & Margolin Inc. | Karnish | Sperry |
| Dynasciences Corp. | Kearfott | S.S. Hunter |
| Standard Prescision | Terstedt | U.S. Gauge |
| Standard Steel | Texas Instruments | U.S. Science Corp. |
| Stewart Warner | Topp | U.S. Time |
| Summers | Transco | Varo |
| Sunbeam | United Aircraft | Veeder-Root |
| Sunstrand | United Control | Wacline |
| Task | Untied Instruments | Wavelabs |
| Teledyne | United Systems Corp. | Weston |
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