000 00289nam a2200121Ia 4500
008 220201s1988 xx 000 0 eng d
082 _bGUP
100 _aGupta, R C
245 0 _aintroduction to automatic telephony
260 _bDhanpat Rai & Sons
_c19889
300 _a272
942 _2ddc
999 _c26310
_d26310