000 00256nam a2200109Ia 4500
008 200701s1998 xx 000 0 eng d
100 _aBISWAS
245 0 _aPRINCIPLES OF TELEPHONY
260 _bDHANPAT RAI PUBLISHERS
_c1998
300 _a185
942 _2ddc
_cGE
999 _c894
_d894