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发明名称
Improvements relating to gramophone and like sound records
摘要
申请公布号
GB340976(A)
申请公布日期
1931.01.01
申请号
GB19290018597
申请日期
1929.06.17
申请人
JEAN DIEUX
发明人
分类号
G11B3/70
主分类号
G11B3/70
代理机构
代理人
主权项
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