000 00314nam a2200121Ia 4500
008 220201s1971 xx 000 0 eng d
041 _aENG
100 _aFRASIER, GEORGE WILLARD
245 0 _aTELECOMMUNICATIONS 2nd
260 _aLONDON
_bTHAMES AND HUDSON PUBLISHING COMPANY
_c1971
300 _a803
942 _2ddc
999 _c45364
_d45364