00643nam a2200229 4500 38688 (BD-RjUL) 20211209052836.0 710706s1970 nyua 000 0 eng 818527309X (BD-RjUL) DLC (BD-RjUL) DLC 621.385 21 BIP 2001 Biswas, Nripendra N., 119368 Principles of telephony by N. N. Biswas. India, Radiant Books. c1988 [2001reprint]. vii, 138 p. illus. 24 cm. Include Index. Telephone, Automatic. 119369 ddc BK 38688 38688 0 0 ddc 0 1 ICE ICE Seminar Library 2016-02-07 0 621.385 BIP 2001 2016-02-07 00:00:00 C-1 2016-02-07 BK 0 0 ddc 0 1 ICE ICE Seminar Library 2016-02-07 0 621.385 BIP 2001 2016-02-07 00:00:00 C-2 2016-02-07 BK