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经营范围
发明名称
Tubes à cathode employés comme redresseurs amplificateurs et oscillateurs
摘要
申请公布号
FR684985(A)
申请公布日期
1930.07.03
申请号
FRD684985
申请日期
1929.11.15
申请人
TELEFUNKEN GESELLSCHAFT FUR 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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