Das, P.N.
Introduction to automatic telephony for the undergraduate students of tele-communication and electrical engineering - 4th ed. - Calcutta Modern book 1975 - 212 p. illus.
Telephony engineering
623.85 / DAS/1975
Introduction to automatic telephony for the undergraduate students of tele-communication and electrical engineering - 4th ed. - Calcutta Modern book 1975 - 212 p. illus.
Telephony engineering
623.85 / DAS/1975