000 00302nam a2200121Ia 4500
008 220201s1998 xx 000 0 eng d
041 _aENG
100 _aBISWAS.N.N
245 0 _aPRINCIPLES OF TELEPHONY
260 _aLONDON
_bTHAMES AND HUDSON PUBLISHING COMPANY
_c1998
300 _a138
942 _2ddc
999 _c61543
_d61543