Biswas, Nripendra N.
Principles of telephony - 1st ed. - Bombay Asia Publishing House 1970 - 144p. illus.
021022312X
Telephony
623.85 / BIS/1970
Principles of telephony - 1st ed. - Bombay Asia Publishing House 1970 - 144p. illus.
021022312X
Telephony
623.85 / BIS/1970