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经营范围
发明名称
Sound recording and reproduction
摘要
申请公布号
US2626320(A)
申请公布日期
1953.01.20
申请号
US19490107034
申请日期
1949.07.27
申请人
RADIO CORPORATION OF AMERICA
发明人
BERGSON GUSTAV
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
主权项
地址
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