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发明名称
Improvements in or relating to electron discharge devices
摘要
申请公布号
GB522458(A)
申请公布日期
1940.06.18
申请号
GB19380036052
申请日期
1938.12.10
申请人
HANS GERHARD LUBSZYNSKI
发明人
分类号
H01J31/34
主分类号
H01J31/34
代理机构
代理人
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