000 00277nam a2200109Ia 4500
008 231212s1968 xx 000 0 und d
041 _aeng
082 _a621.3841
100 _aJolley E.H.
245 _aIntroduction To Telephony
260 _aAllahabad
_bInternational Book
_c1968
999 _c959043
_d959043