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经营范围
发明名称
Improvements in or relating to thermionic valves
摘要
申请公布号
GB427360(A)
申请公布日期
1935.04.23
申请号
GB19340006237
申请日期
1934.02.26
申请人
JEROME CONRAD SMITH
发明人
分类号
H01J21/20
主分类号
H01J21/20
代理机构
代理人
主权项
地址
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