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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
GB737883(A)
申请公布日期
1955.10.05
申请号
GB19520014220
申请日期
1952.06.05
申请人
THE MULLARD RADIO VALVE COMPANY LIMITED
发明人
FRY NORA;GENTRY CHARLES HAROLD RAYMOND
分类号
H01J1/14
主分类号
H01J1/14
代理机构
代理人
主权项
地址
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