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发明名称
Elektronrør med Koncentrationselektrode og Accelerationselektrode.
摘要
申请公布号
DK57659(C)
申请公布日期
1940.06.03
申请号
DKD57659
申请日期
1939.02.15
申请人
THE M-O VALVE COMPANY LIMITED
发明人
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主分类号
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