000 00307nam a2200121Ia 4500
008 220201s1969 xx 000 0 eng d
082 _a621.384132
100 _aGewartowshi, James w & Watson
245 0 _aIntroduction to electro tubes
260 _bNewyork: Nostrand
_c1969
300 _a373
942 _2ddc
999 _c75919
_d75919