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发明名称
Elektrodynamisches Telephon
摘要
申请公布号
DE549446(C)
申请公布日期
1932.04.27
申请号
DED549446D
申请日期
1930.11.21
申请人
SIEMENS & HALSKE AKT.-GES.
发明人
分类号
H04R9/02;H04R9/04
主分类号
H04R9/02
代理机构
代理人
主权项
地址
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