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发明名称
Improvements in thermionic electrodes
摘要
申请公布号
GB438683(A)
申请公布日期
1935.11.21
申请号
GB19340031860
申请日期
1934.11.06
申请人
PATENT-TREUHAND-GESELLSCHAFT FUER ELECTRISCHE GLUEHLAMPEN M.B.H.
发明人
分类号
H01J61/067
主分类号
H01J61/067
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代理人
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