000 00284nam a2200133Ia 4500
100 _aKennedy/ Davis.
250 _a4
942 _cBK
654 _aelectronic
245 _aElectronic communication system
260 _bTata Mc Graw hill
_c1993
300 _a763
546 _aENGLISH
999 _c20255
_d20255