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发明名称
Improvements in or relating to electron discharge devices
摘要
申请公布号
GB469558(A)
申请公布日期
1937.07.27
申请号
GB19360002511
申请日期
1936.01.27
申请人
MARZELL HARMAN
发明人
分类号
H04N5/74
主分类号
H04N5/74
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代理人
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