Improvements in or relating to means for obtaining heating current for the filaments of thermionic valves from a rectified alternating current or a pulsating direct current source
摘要
申请公布号
GB336128(A)
申请公布日期
1930.10.09
申请号
GB19290033870
申请日期
1929.11.06
申请人
TELEFUNKEN, GESELLSCHAFT FUER DRAHTLOSE TELEGRAPHIE M.B.H.
