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发明名称
Method and apparatus for recording and reproducing photographic sound records
摘要
申请公布号
US1946589(A)
申请公布日期
1934.02.13
申请号
US19300497441
申请日期
1930.11.22
申请人
OWENS FREEMAN H
发明人
OWENS FREEMAN H.
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
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地址
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