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经营范围
发明名称
Tube à cathode chauffée et électrode de commande
摘要
申请公布号
FR700923(A)
申请公布日期
1931.03.09
申请号
FRD700923
申请日期
1930.08.21
申请人
TELEFUNKEN GESELLSCHAFT FUR DRAHTLOSE TELEGRAPHIE M.B.H.
发明人
分类号
H01J21/36
主分类号
H01J21/36
代理机构
代理人
主权项
地址
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