000 00319nam a2200133Ia 4500
008 220201s1985 xx 000 0 eng d
041 _aENG
100 _aI.S:5687-1970
245 0 _aTELECOMMUNICATION
250 _a2ND
260 _aLONDON
_bTHAMES AND HUDSON PUBLISHING COMPANY
_c1985
300 _a803
942 _2ddc
999 _c57345
_d57345