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发明名称
Improvements in and relating to thermionic valves
摘要
申请公布号
GB633926(A)
申请公布日期
1949.12.30
申请号
GB19470034740
申请日期
1947.12.30
申请人
METROPOLITAN-VICKERS ELECTRICAL COMPANY LIMITED
发明人
分类号
H01J19/34
主分类号
H01J19/34
代理机构
代理人
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地址
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