Telephony & telegraphy A an introduction to telephone and telegraph instruments and exchanges,
Smith, Sydney F
Telephony & telegraphy A an introduction to telephone and telegraph instruments and exchanges, by Sydney F. Smith - 2d ed. - London, Oxford U.P. c1974 - xv, 282 p. illus. 25 cm
Third ed. published in 1978 under title: Telephony and telegraphy
Bibliography: p. [260]
0198593449
Telegraph
Telephone
Telephony & telegraphy A an introduction to telephone and telegraph instruments and exchanges, by Sydney F. Smith - 2d ed. - London, Oxford U.P. c1974 - xv, 282 p. illus. 25 cm
Third ed. published in 1978 under title: Telephony and telegraphy
Bibliography: p. [260]
0198593449
Telegraph
Telephone