000 00233nam a2200097Ia 4500
008 211209s9999 xx 000 0 und d
041 _aeng
100 _aTHYAGARAJANVISHWANATHAN
245 _aTELECOMMUNICATION SWITCHING
260 _bPHI
999 _c90196
_d90196