000 00260nam a2200109Ia 4500
008 160710s1948 xx 000 0 und d
100 _aSPENGERBERG,KARL P.
245 _aVACCUM TUBES
260 _aNEW YORK
_bMCGRAW HILL
_c1948
300 _a860
942 _2ddc
_cB
999 _c26192
_d26192