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发明名称
Hearing aid
摘要
申请公布号
US2804932(A)
申请公布日期
1957.09.03
申请号
US19560609828
申请日期
1956.09.14
申请人
BEDARD JOSEPH A
发明人
BEDARD JOSEPH A.
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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