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发明名称
Hearing aid
摘要
申请公布号
US2633927(A)
申请公布日期
1953.04.07
申请号
US19500160564
申请日期
1950.05.06
申请人
ANNAS
发明人
ANNAS PAUL J.;BICE RAYMOND A.
分类号
A61F11/00
主分类号
A61F11/00
代理机构
代理人
主权项
地址
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