000 00304nam a2200121Ia 4500
008 230222s9999 xx 000 0 und d
082 _a621.382
100 _aJanaki Raman Raja
245 2 _aA text book on Communication switching systems
250 _a1
260 _bAnuradha Agencies
_c2002
942 _cBK
999 _c5221
_d5221