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经营范围
发明名称
Perfectionnements aux montages de cathodes à chauffage indirect
摘要
申请公布号
FR775419(A)
申请公布日期
1934.12.28
申请号
FRD775419
申请日期
1934.07.06
申请人
TELEFUNKEN GESELLSCHAFT FUER DRAHTLOSE TELEGRAPHIE M.B.H.
发明人
分类号
H01J1/20
主分类号
H01J1/20
代理机构
代理人
主权项
地址
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