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发明名称
Improvements in hearing aids
摘要
申请公布号
GB0221473(D0)
申请公布日期
2002.10.23
申请号
GB20020021473
申请日期
2002.09.16
申请人
CONTACTA LIMITED
发明人
分类号
B42F9/00;H04R25/00
主分类号
B42F9/00
代理机构
代理人
主权项
地址
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