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发明名称
Verfahren zur Verbesserung des Vakuums in Elektronenroehren
摘要
申请公布号
DE549981(C)
申请公布日期
1932.05.10
申请号
DED549981D
申请日期
1930.10.08
申请人
RADIOWERK E. SCHRACK AKT.-GES.
发明人
分类号
H01J7/18
主分类号
H01J7/18
代理机构
代理人
主权项
地址
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