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发明名称
Improvements relating to thermionic valves
摘要
申请公布号
GB523574(A)
申请公布日期
1940.07.17
申请号
GB19390000517
申请日期
1939.01.06
申请人
STANDARD TELEPHONES AND CABLES LIMITED;WILLIAM THOMAS GIBSON
发明人
分类号
H01J1/15
主分类号
H01J1/15
代理机构
代理人
主权项
地址
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