TY  - BOOK
AU  - Smith,Sydney F.
TI  - Telephony and telegraphy: an introduction to telephone and teegraph instruments and exchanges 
U1  -  621.385 
PY  - 1969///
CY  - Glasgow
PB  - Oxford University Press
KW  - Telephone
KW  - Telegraph
N1  - Includes index
ER  -