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经营范围
发明名称
électrode pour tubes à vide, en particulier pour redresseurs à gros débits
摘要
申请公布号
FR790636(A)
申请公布日期
1935.11.25
申请号
FRD790636
申请日期
1935.05.28
申请人
发明人
LEHMANN WALTER
分类号
H01J13/16
主分类号
H01J13/16
代理机构
代理人
主权项
地址
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