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经营范围
发明名称
Filament for thermionic tube
摘要
申请公布号
US1987424(A)
申请公布日期
1935.01.08
申请号
US19320624252
申请日期
1932.07.23
申请人
TELEFUNKEN GESELLSCHAFT FUR DRAHTLOSE TELEGRAPHIE M.B.H.
发明人
WEHNERT WALDEMAR
分类号
H01J1/15
主分类号
H01J1/15
代理机构
代理人
主权项
地址
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