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经营范围
发明名称
Nouveau dispositif facilitant l'étude des gammes au piano
摘要
申请公布号
FR740518(A)
申请公布日期
1933.01.27
申请号
FRD740518
申请日期
1932.07.27
申请人
发明人
PONCET
分类号
G09B15/00
主分类号
G09B15/00
代理机构
代理人
主权项
地址
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