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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
GB675196(A)
申请公布日期
1952.07.09
申请号
GB19490003744
申请日期
1949.02.10
申请人
THE M-O VALVE COMPANY LIMITED;GEOFFREY WILLIAM WARREN
发明人
分类号
H01J23/06
主分类号
H01J23/06
代理机构
代理人
主权项
地址
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