000			00301nam a2200121 4500
008			160616s 000 0
245			_aThermionic vacuum tubes and their applications
100			_aAldous, W.H.
100			_aAppleton, E
500			_aD66 K1
942			_cBK _2BK10746
080			_a621.6 ALD
999			_c10746 _d10746