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经营范围
发明名称
Sound recording apparatus
摘要
申请公布号
US2257466(A)
申请公布日期
1941.09.30
申请号
US19400325766
申请日期
1940.03.25
申请人
FRANK RAFFLES
发明人
HOWELL HUGH A.
分类号
G11B3/08
主分类号
G11B3/08
代理机构
代理人
主权项
地址
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