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经营范围
发明名称
Fabrication des cathodes photo-électriques
摘要
申请公布号
FR707465(A)
申请公布日期
1931.07.08
申请号
FRD707465
申请日期
1930.12.12
申请人
THE GENERAL ELECTRIC COMPANY LIMITED
发明人
分类号
H01J40/06
主分类号
H01J40/06
代理机构
代理人
主权项
地址
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