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发明名称
Appareil didactique utilisé pour l'enseignement des mathématiques élémentaires
摘要
申请公布号
FR1364293(A)
申请公布日期
1964.06.19
申请号
FR19630938888
申请日期
1963.06.21
申请人
发明人
SCHRAMM CHRIS
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
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地址
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