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经营范围
发明名称
Improvement in commercial phonographs
摘要
申请公布号
GB538577(A)
申请公布日期
1941.08.08
申请号
GB19400010628
申请日期
1940.06.20
申请人
DICTAPHONE CORPORATION
发明人
分类号
G11B3/34
主分类号
G11B3/34
代理机构
代理人
主权项
地址
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