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发明名称
Hearing-aid device
摘要
申请公布号
US1940553(A)
申请公布日期
1933.12.19
申请号
US19320614674
申请日期
1932.06.01
申请人
LIEBER PATENTS CORPORATION
发明人
LIEBER HUGO
分类号
H04R11/00
主分类号
H04R11/00
代理机构
代理人
主权项
地址
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