000 00314nam a2200121Ia 4500
008 220201s1970 xx 000 0 eng d
041 _aENG
100 _aATHINSON, J
245 0 _aTELEPHONY
_bDISCRETE AND INTEGRATED
260 _aLONDON
_bTHAMES AND HUDSON PUBLISHING COMPANY
_c1970
300 _a509
942 _2ddc
999 _c45154
_d45154