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经营范围
发明名称
Planchette pour l'enseignement des chiffres et des nombres
摘要
申请公布号
FR1007998(A)
申请公布日期
1952.05.12
申请号
FRD1007998
申请日期
1950.01.05
申请人
发明人
SEJOURNE
分类号
G09B17/00
主分类号
G09B17/00
代理机构
代理人
主权项
地址
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