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发明名称
Condensed photophonographic sound record
摘要
申请公布号
US1897247(A)
申请公布日期
1933.02.14
申请号
US19300504622
申请日期
1930.12.24
申请人
RADIO CORPORATION OF AMERICA
发明人
ELDRED BYRON E.
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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