Produttori
- California Audio Labs
- California Instruments
- Cambridge Technology
- Camco
- Candy
- Canon
- Canton
- Carl Zeiss
- Cartex
- Carver
- Casio
- Catu
- CBS Laboratories
- C.Crane
- CEC Chuo Denki
- Central Electronics
- Century Electronics
- Chauvin Arnoux
- Cherokee
- Chicago Transformer
- Chinaglia Dino Elettrocostruzioni
- Chongqing XieGu Technology Co.
- Christian Schwaiger Gmbh
- Chrysler
- Citizen
- Clamann & Grahnert
- Claricon
- Clarion
- Clark Hess Communication Research Corp
- Clarostat Mfg. Co. Inc.
- Clatronic
- CM Clemens Manufacturing Company
- Cobra
- Coby
- Codar Radio Company
- Cognitive Vision Inc
- COHU Electronics inc
- Collins Telecommunications
- Combinova
- Commodore
- Communication Technology Group
- Compaq Computer Corporation
- Compliance Design Inc.
- Compliance West
- Computer Automation Technology
- Conar Coletronics Service Inc.
- Connex
- Conrad
- Continental Edison
- Conway Electronic Enterprises Limited
- Cornell Dubilier Electronics
- Cosmed
- Cossor
- Coutant Electronics
- Cox
- CRC
- Creative
- Crest Audio
- Crosby Laboratories
- Crown
- CRT
- Crumar
- CTC Union Technologies
- CTE International
- CTR Elektronik
- CT Systems INC
- CTX
- Cushcraft Corporation
- Cushman Electronics Inc.
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