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发明名称
Improvements in or relating to high-frequency electronic devices in which an electromagnetic field is caused to interact with an electron stream
摘要
申请公布号
GB623985(A)
申请公布日期
1949.05.26
申请号
GB19440002610
申请日期
1944.02.11
申请人
WESTERN ELECTRIC COMPANY INCORPORATED
发明人
分类号
H01J25/12
主分类号
H01J25/12
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