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发明名称
Improvements in and relating to hearing aids
摘要
申请公布号
GB931767(A)
申请公布日期
1963.07.17
申请号
GB19590031305
申请日期
1959.09.14
申请人
FORTIPHONE LIMITED
发明人
CARLING FRANCIS ROCK
分类号
H04R25/02
主分类号
H04R25/02
代理机构
代理人
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