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发明名称
Perfectionnement apporté aux phonographes à caisse de résonance
摘要
申请公布号
FR698237(A)
申请公布日期
1931.01.28
申请号
FRD698237
申请日期
1930.07.01
申请人
发明人
DUFOUR PAUL
分类号
G11B25/04
主分类号
G11B25/04
代理机构
代理人
主权项
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