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经营范围
发明名称
Elektronenroehre
摘要
申请公布号
DE682297(C)
申请公布日期
1939.10.12
申请号
DE1935E047402D
申请日期
1935.09.25
申请人
ELECTRIC & MUSICAL INDUSTRIES LIMITED
发明人
分类号
H01J21/02
主分类号
H01J21/02
代理机构
代理人
主权项
地址
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