000 00300nam a2200121Ia 4500
008 220201s1973 xx 000 0 eng d
041 _aENG
100 _aRAMABHODRAM, S
245 0 _aTELECOMMUNICATION
260 _aLONDON
_bTHAMES AND HUDSON PUBLISHING COMPANY
_c1973
300 _a841
942 _2ddc
999 _c49619
_d49619