manufacturer
- Citizen (20)
- CKS (2)
- Cognitive Solutions (1)
- Colop (2)
- COM-Star (1)
- Combina (1)
- Comdata (1)
- Comlog (2)
- Commodore (CBM) (12)
- Compaq (16)
- Compuadd (1)
- Compuprint (26)
- Comtech (2)
- Comterm (1)
- Comtex (1)
- Consul (6)
- Continental (7)
- Control Data Corporation (1)
- Copal (1)
- Copy-MAT (1)
- Copystar (42)
- COT (2)
- Courier (1)
- CPF (5)
- Creed (1)
- CTI (1)
- Cyber (2)
- Cybert (1)