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发明名称
Improvements in vacuum electric tube devices
摘要
申请公布号
GB625884(A)
申请公布日期
1940.02.09
申请号
GB19380014376
申请日期
1938.05.13
申请人
JOHN MATHIESON DODDS;JOHN HEYWOOD LUDLOW;METROPOLITAN-VICKERS ELECTRICAL COMPANY LIMITED
发明人
分类号
H01J21/06
主分类号
H01J21/06
代理机构
代理人
主权项
地址
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