000 00271nam a2200109Ia 4500
999 _c8375
_d8375
020 _a0283431803
100 _aAtkinson J
245 _aTelephony Vol- I: General Principles and Manual Exchange Systems
260 _c1979
_bPITMAN
_aLondon
300 _axii+509
942 _cBK