000 00312nam a2200133Ia 4500
008 180115s9999||||xx |||||||||||||| ||und||
082 _a621.385
100 _aDAS P.N
245 0 _aINTRODUCTION TO AUTOMATIC TELEPHONY
250 _aSeventh
260 _aCALCUTTA
_bM.B.V.A
_c1987
300 _a256
650 _aTelephony
942 _cGEN_BK
999 _c10791
_d10791