TY  - BOOK
AU  - Redmill, F. J.
AU  - Valdar, A. R.
TI  - SPC DIGITAL TELEPHONE EXCHANGES
U1  - 621.385 
PY  - 1990///
CY  - London
PB  - Peter Peregrinus
KW  - Telephone Stations Telophone Switching Systems, Electronic
ER  -