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经营范围
发明名称
Sound recording apparatus
摘要
申请公布号
US1999700(A)
申请公布日期
1935.04.30
申请号
US19310539899
申请日期
1931.05.25
申请人
RADIO CORPORATION
发明人
KREUSER BARTON
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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