000			00421nam a2200145Ia 4500
008			170101s1965 xx 000 0 und d
082			_a621.384 G28P
100			_aGEWARTOWSKI, J.W.
245		0	_aPrinciples of electron tubes; including grid-controlled tubes microwave tubes and gas tubes
260			_bPrinceton,U.S _c1965
300			_a655p
650			_aELECTION TUBES
653			_aELECTION TUBES
942			_2ddc _cB
999			_c24141 _d24141