000 00299nam a2200121Ia 4500
008 220120s9999||||xx |||||||||||||| ||und||
020 _a9781842556207
082 _a621.382 CHA
100 _aChandrashekaraiah, P.M
245 0 _aTelecommunication switching
260 _bLondon
300 _a200p.
_b0
999 _c136460
_d136460