000 00423nam a2200181Ia 4500
008 200901s9999||||xx |||||||||||||| ||und||
020 _a4000000406
100 _aBiswas N N
_93779
245 0 _aPrinciples of Telephony
250 _a-
264 _bRadiant Books
_c1986
300 _a130
490 _a-
500 _a-
546 _aENG
650 _a"Electronics and Communication, "Telephony
_941393
942 _cBK
999 _c25329
_d25329