Telephony and telegraphy : an introduction to instruments and switching systems (Electromechanical and reed-electronic) /

Telephony and telegraphy : an introduction to instruments and switching systems (Electromechanical and reed-electronic) /

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Bibliographic Details
Main Author:	400952 Smith, Sydney F.
Format:
Published:	Oxford : Oxford University Pr., 1978
Subjects:	Telephone Telegraph