Principles of telephony /
Biswas, Nripendra N.
Principles of telephony / Nripendra N. Biswas. - New Delhi : Radiant Books & Publishers, c1970. - 130 p. : ill. ; 23 cm.
Telecommunication.
Telecommunication engineering.
384
Principles of telephony / Nripendra N. Biswas. - New Delhi : Radiant Books & Publishers, c1970. - 130 p. : ill. ; 23 cm.
Telecommunication.
Telecommunication engineering.
384