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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
GB648972(A)
申请公布日期
1951.01.17
申请号
GB19470027519
申请日期
1947.10.14
申请人
THE M-O VALVE COMPANY LIMITED;ALFRED GEORGE HAYES;REGINALD CHARLES MOORE
发明人
分类号
H01J19/50
主分类号
H01J19/50
代理机构
代理人
主权项
地址
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