000 00272nam a2200109Ia 4500
008 220201s1994 xx 000 0 eng d
100 _aJolley, EH
245 0 _aIntroduction to telephony & telegraphy
260 _bAllahbad:AW Wheeler
_c1994
300 _a413
942 _2ddc
999 _c86309
_d86309