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发明名称
Hearing aid
摘要
申请公布号
US2122429(A)
申请公布日期
1938.07.05
申请号
US19340741487
申请日期
1934.08.25
申请人
LIEBER PATENTS CORPORATION
发明人
LIEBER HUGO
分类号
H04R25/00
主分类号
H04R25/00
代理机构
代理人
主权项
地址
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