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经营范围
发明名称
Electro-acoustic transducer
摘要
申请公布号
GB2025733(A)
申请公布日期
1980.01.23
申请号
GB19790024085
申请日期
1979.07.11
申请人
SIEMENS AG
发明人
分类号
H04R17/00;(IPC1-7):H04R1/28
主分类号
H04R17/00
代理机构
代理人
主权项
地址
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