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发明名称
Sound reproducing apparatus
摘要
申请公布号
US2241131(A)
申请公布日期
1941.05.06
申请号
US19380244736
申请日期
1938.12.09
申请人
HOLLOWAY JOHN Q A
发明人
HOLLOWAY JOHN Q. A.
分类号
主分类号
代理机构
代理人
主权项
地址
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