000			00332nam a2200133Ia 4500
005			20260205054103.0
008			260111s9999||||xx |||||||||||||| ||und||
082			_a621.387 Al41d
100			_aAli, Syed. Riffat.
245		0	_aDigital switching systems
260			_aN. Delhi _bTata Mcgraw _c2002
300			_a219p.
942			_cBK
999			_c132534 _d132534