000 00316nam a2200133Ia 4500
008 220201s1970 xx 000 0 eng d
082 _a621.382
_bFRA
100 _aFraser, W.
245 0 _aTelecommunication
250 _a2
260 _aLondon
_bEnglish language book society
_c1970
300 _a803
942 _2ddc
999 _c21647
_d21647