000 00321nam a2200121Ia 4500
008 220201s1958 xx 000 0 eng d
041 _aENG
100 _aSOWERS, G F
245 0 _aVACCUM-TUBE AND SEMICONDUCTOR ELECTRONICS
260 _aLONDON
_bTHAMES AND HUDSON PUBLISHING COMPANY
_c1958
300 _a644
942 _2ddc
999 _c40654
_d40654