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发明名称
Spectacles concealed hearing-aid
摘要
申请公布号
US2930857(A)
申请公布日期
1960.03.29
申请号
US19530401629
申请日期
1953.12.31
申请人
ELEANOR HUMPHRIES
发明人
HOLLINGSWORTH ELEANOR
分类号
G02C11/06
主分类号
G02C11/06
代理机构
代理人
主权项
地址
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