000			00345nam a2200133Ia 4500
008			220217s9999||||xx |||||||||||||| ||und||
020			_a81-85273-09-X
082			_a621.3857 BIS
100			_aBiswas, Nripendra, N
245		0	_aPrinciples if telephony
260			_aRadiant books _bBangalore _c1998
300			_b35
650			_aTELEPHONY
999			_c165789 _d165789