TY  - BOOK
AU  - Smith, Sydney F
AU  - xx, 686 p.
AU  - Title
TI  - Telephony & telegraphy A: an introduction to telephone and telegraph instruments and exchanges,
SN  - 0198593449
PY  - 1974///
CY  - London
PB  - Oxford U.P.
KW  - Telegraph
KW  - Telephone
N1  - Third ed. published in 1978 under title: Telephony and telegraphy; Bibliography: p. [260]
ER  -