000 00258nam a2200109Ia 4500
008 230401s9999 xx 000 0 eng d
100 _aVISHVANATHAN(THIAGARAJAN)
245 0 _aTELECOMMUNICATION SWITCHING
250 _a22
260 _bPHI
942 _2ddc
_cBTECH
999 _c4683
_d4683