000 00277nam a2200109Ia 4500
008 230401s9999 xx 000 0 eng d
100 _aVISHVANATHAN (THIAGRAJAN)
245 0 _aTELECOMMUNICATION SWITCHING SYSTEM AND NETWORKS
250 _a1
260 _bPHI
942 _2ddc
_cBTECH
999 _c4809
_d4809