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| Amatom Electronic Hardware | Amber Industries | AMCC |
| Amco Engineering | AmerCable | American Accurate Components |
| American Advantech | American Audio Components | American Bright Optoelectronics |
| American Capacitor | American Connector | American Cores & Electronics |
| American Dynamics/CCTV Div. of Sensormatic | American Electrical | American Electronic Ceramics |
| American Electronic Components | American Fittings Corp. | American Hakko Products |
| American Insulated Wire | American KSS | American Megatrends |
| American Micro Products | American Microsemiconductor | American Opto Plus |
| American Power Conversion | American Power Design | American Power Devices |
| American Radio Relay League | American Relays | American Reliance |
| American Research & Engineering | American Seal (ASI) | American Sigma/Hach |
| American Solenoid | American Technical Ceramics | American Tool |
| American Tools Company | American Toppower | American Ultraviolet |
| American Zettler (Also see AZ Displays; Zettler Ma | Americord | Ameritec |
| Ametek | Ametek Drexelbrook | Ametek NCC (National Controls Corp) |
| Ametek Panalarm | Ametek Patriot Sensors | Ametek Rochester Instruments |
| Ametek Rotron | Ametek Solidstate Controls | Ametek Test & Calibration Instruments Div |
| Ametek-PMT Div. | Ametek-Process & Analytical Instrument | Ametherm |
| AMI Semiconductor | Amidon Associates | Amiga |
| AMOS | Amp Display | AMP Netconnect/Tyco Electronics |
| AMP/Tyco Electronics | Amperite | Amperor |
| Amphenol Aerospace & Industrial Operations | Amphenol AIR LB N. America | Amphenol Alden Products |
| Amphenol Canada |
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