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发明名称
Disk record and film record sound reproducer
摘要
申请公布号
US2521476(A)
申请公布日期
1950.09.05
申请号
US19460669779
申请日期
1946.05.15
申请人
OWENS FREEMAN H
发明人
OWENS FREEMAN H.
分类号
主分类号
代理机构
代理人
主权项
地址
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