000 00318nam a2200121Ia 4500
008 220201s1997 xx 000 0 eng d
041 _aENG
100 _aJALLEY,E.H
245 0 _aINTRODUCTION TO TELEPHONEY & TELEGRAPHY
260 _aLONDON
_bTHAMES AND HUDSON PUBLISHING COMPANY
_c1997
300 _a412
942 _2ddc
999 _c61748
_d61748