000 00261nam a2200109Ia 4500
008 190703s9999 xx 000 0 und d
082 _a621.385 B621
100 _aBISWAS,N.N
245 0 _aPRINCIPLES OF TELEPHONY
260 _aBANGALORE
_bRADIANT
942 _cBB
_2DDC
999 _c5417
_d5417