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发明名称
Hearing aid device
摘要
申请公布号
US2322952(A)
申请公布日期
1943.06.29
申请号
US19400344853
申请日期
1940.07.11
申请人
AUREX CORPORATION
发明人
NICHOLIDES EMMANUEL CHRIST
分类号
H04R17/00
主分类号
H04R17/00
代理机构
代理人
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地址
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