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发明名称
Improvements in and relating to thermionic devices
摘要
申请公布号
GB374126(A)
申请公布日期
1932.06.06
申请号
GB19310006807
申请日期
1931.03.05
申请人
PAUL FREEDMAN
发明人
分类号
H01J1/22
主分类号
H01J1/22
代理机构
代理人
主权项
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