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发明名称
Earphone
摘要
申请公布号
US1811639(A)
申请公布日期
1931.06.23
申请号
US19290412686
申请日期
1929.12.09
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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