NCR data communications concepts

Manylion Llyfryddiaeth
Awdur Corfforaethol:	National Cash Register Company (Dayton, Ohio). Technical Education Department
Fformat:	Llyfr
Iaith:	Saesneg
Cyhoeddwyd:	Derby, Conn. E & L Instruments 1978.
Rhifyn:	Rev.
Cyfres:	Bug-book continuing education series 6
Pynciau:	Data transmission systems. Telecommunication.