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发明名称
Microphone
摘要
申请公布号
US2157720(A)
申请公布日期
1939.05.09
申请号
US19340738460
申请日期
1934.08.04
申请人
TELEFUNKEN GESELLSCHAFT FUR DRAHTLOSE TELEGRAPHIE M.B.H.
发明人
SEVERIN EDWIN
分类号
H04R1/14
主分类号
H04R1/14
代理机构
代理人
主权项
地址
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