Biswas, Nripendra Nath, 1928-
Principles of telephony [by] N. N. Biswas. - New York, Asia Pub. House [c1970] - vii, 138 p. illus. 24 cm.
021022312X
77025524
Telephone, Automatic.
TK6397 / .B48 1970
Principles of telephony [by] N. N. Biswas. - New York, Asia Pub. House [c1970] - vii, 138 p. illus. 24 cm.
021022312X
77025524
Telephone, Automatic.
TK6397 / .B48 1970