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发明名称
Sound reproducing apparatus
摘要
申请公布号
US1929119(A)
申请公布日期
1933.10.03
申请号
US19300463663
申请日期
1930.06.25
申请人
OWENS FREEMAN H
发明人
OWENS FREEMAN H.
分类号
G03B31/00;G11B7/00
主分类号
G03B31/00
代理机构
代理人
主权项
地址
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