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发明名称
Improvements in the exhaustion of thermionic devices
摘要
申请公布号
GB339961(A)
申请公布日期
1930.12.11
申请号
GB19290027659
申请日期
1929.09.11
申请人
PAUL FREEDMAN
发明人
分类号
H01J7/18
主分类号
H01J7/18
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代理人
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