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发明名称
Improvements in thermionic valves
摘要
申请公布号
GB510703(A)
申请公布日期
1939.08.04
申请号
GB19380000255
申请日期
1938.01.04
申请人
ERNEST YEOMAN ROBINSON;METROPOLITAN-VICKERS ELECTRICAL COMPANY LIMITED
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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