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发明名称
Sound recording
摘要
申请公布号
US2125890(A)
申请公布日期
1938.08.09
申请号
US19360087618
申请日期
1936.06.27
申请人
RADIO CORPORATION OF AMERICA
发明人
COOK ELLSWORTH D.
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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