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发明名称
Improvements in or relating to velocity-modulated electron discharge devices
摘要
申请公布号
GB640697(A)
申请公布日期
1950.07.26
申请号
GB19450034493
申请日期
1945.12.20
申请人
PHILIPS LAMPS LIMITED
发明人
分类号
H01J25/10;H01J25/32
主分类号
H01J25/10
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