TY  - BOOK
AU  - Brown, C W.
TI  - Automatic telephony simplified
U1  - 621.3857 
PY  - 1928///
CY  - London
PB  - Isaac Pitman and Sons
KW  - Automatic telephony
KW  - Telephone systems
KW  - Crossbar systems
N1  - Includes index
ER  -