000 00259nam a2200109Ia 4500
999 _c25616
_d25616
020 _a8185614369
100 _aJolley E H
245 _aIntroduction to Telephony and Telegraphy
260 _c1997
_bWHEELER PUBLISHING
_aNew Delhi
300 _ax+403
942 _cBB