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发明名称
Ear insert hearing aid
摘要
申请公布号
US2971065(A)
申请公布日期
1961.02.07
申请号
US19570705949
申请日期
1957.12.30
申请人
SONOTONE CORPORATION
发明人
BUSSE HAROLD M.
分类号
H04R25/02
主分类号
H04R25/02
代理机构
代理人
主权项
地址
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