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发明名称
Improvements in and relating to thermionic valves and circuits
摘要
申请公布号
GB573208(A)
申请公布日期
1945.11.12
申请号
GB19400013889
申请日期
1940.09.05
申请人
JOHN HENRY OWEN HARRIES
发明人
分类号
H01J7/24
主分类号
H01J7/24
代理机构
代理人
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