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发明名称
Photographic sound reproducing apparatus
摘要
申请公布号
US1833370(A)
申请公布日期
1931.11.24
申请号
US19290371809
申请日期
1929.06.18
申请人
OWENS DEVELOPMENT CORPORATION
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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