000 00254nam a22001097a 4500
082 _a621.385 HOL
100 _aJOLLEY, E. H
_976713
245 _aINTRODUCTION TO TELEPHONY AND TELEGRAPHY
260 _aNEWYORK
_bHART
_c1968
300 _a413P
942 _cBK
999 _c582056
_d582056