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经营范围
发明名称
Radio apparatus for intercommunication or duplex operation
摘要
申请公布号
US1874993(A)
申请公布日期
1932.08.30
申请号
US19290357635
申请日期
1929.04.24
申请人
TELEFUNKEN GESELLSCHAFT FUR DRAHTLOSE TELEGRAPHIE M. B. H.
发明人
HEFFNER KARL
分类号
H04B1/48
主分类号
H04B1/48
代理机构
代理人
主权项
地址
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