000			00392nam a2200169Ia 4500
008			160615s9999 xx 000 0 und d
100			_aAPPLETON(E V)
245			_aThermionic vacuum tubes and their applications
250			_a6 ed.
260			_aLondon
260			_bMethuen & Co.
260			_c1952
300			_av p. + 160
942			_cBooks
999			_c6933 _d6933