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经营范围
发明名称
Recording and reproducing sound
摘要
申请公布号
US2238735(A)
申请公布日期
1941.04.15
申请号
US19400361573
申请日期
1940.10.17
申请人
RADIO CORPORATION OF AMERICA
发明人
HULLEGARD ERIK WALDEMAR
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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