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经营范围
发明名称
Improvements in or relating to electron discharge devices
摘要
申请公布号
GB521558(A)
申请公布日期
1940.05.24
申请号
GB19380033582
申请日期
1938.11.18
申请人
STANDARD TELEPHONES AND CABLES LIMITED;ABRAHAM ISIDORE VANGEEN
发明人
分类号
H01J5/46;H01J19/50
主分类号
H01J5/46
代理机构
代理人
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地址
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