Telephony and telegraphy A : an introduction to instruments and exchanges (step-by-step and common control) /
Smith, Sydney F.
Telephony and telegraphy A : an introduction to instruments and exchanges (step-by-step and common control) / by Sydney F. Smith. - 2nd ed. - London : Oxford University Press, 1974. - xv, 282 p. : ill.
0198593465
Communication engineering.
Telecommunication systems.
Telephone sysytems.
Telegraph.
Telephony and telegraphy A : an introduction to instruments and exchanges (step-by-step and common control) / by Sydney F. Smith. - 2nd ed. - London : Oxford University Press, 1974. - xv, 282 p. : ill.
0198593465
Communication engineering.
Telecommunication systems.
Telephone sysytems.
Telegraph.