000 00270nam a2200109Ia 45e0
008 181001s1934 xx 000 0 und d
100 _aHenney K.
245 0 _aElectron tubes in Industry
260 _bMcGraw Hill
_c1934
300 _a490
942 _2ddc
_cBK
999 _c1320
_d1320