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发明名称
Earpiece for ear phones
摘要
申请公布号
US1893474(A)
申请公布日期
1933.01.03
申请号
US19310540317
申请日期
1931.05.27
申请人
SONOTONE 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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