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经营范围
发明名称
HEARING AIDS
摘要
申请公布号
GB1582821(A)
申请公布日期
1981.01.14
申请号
GB19780014431
申请日期
1978.04.12
申请人
SIEMENS AG
发明人
分类号
H04R25/00;(IPC1-7):H04R25/00
主分类号
H04R25/00
代理机构
代理人
主权项
地址
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