Atkinson, J.
Telephony a detailed exposition of the telephone exchange systems of the british post office - 1st ed. - London Pitman 1970 - xii, 509p. illus.
Vol. I : General principles and manual exchange systems
0283431803
Telephone engineering
623.85 / ATK/1970
Telephony a detailed exposition of the telephone exchange systems of the british post office - 1st ed. - London Pitman 1970 - xii, 509p. illus.
Vol. I : General principles and manual exchange systems
0283431803
Telephone engineering
623.85 / ATK/1970