000 00263nam a2200109Ia 4500
008 170101s2001 xx 000 0 und d
100 _aBISWAS, N.N.
245 0 _aPRINCIPLES OF TELEPHONY
260 _aNEW DELHI
_bRADIANT
_c2001
650 _aECE
942 _2ddc
_cBK
_03
999 _c6549
_d6549