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发明名称
Bone conduction hearing device
摘要
申请公布号
USRE20896(E)
申请公布日期
1938.10.25
申请号
US19380228191
申请日期
1938.09.02
申请人
GREIBACH EMIL HENRY
发明人
GREIBACH EMIL HENRY
分类号
H04R11/00
主分类号
H04R11/00
代理机构
代理人
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