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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
GB424111(A)
申请公布日期
1935.02.14
申请号
GB19340016305
申请日期
1934.05.31
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
分类号
H01J19/44
主分类号
H01J19/44
代理机构
代理人
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地址
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