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经营范围
发明名称
Kohlemikrophon fuer Fernsprechgeraete
摘要
申请公布号
DE1762854(A1)
申请公布日期
1970.10.29
申请号
DE19681762854
申请日期
1968.09.10
申请人
SIEMENS AG
发明人
FRANKEN,DIPL.-ING.JOHANNES
分类号
H04R21/02
主分类号
H04R21/02
代理机构
代理人
主权项
地址
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