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发明名称
MAGNETIC MANIPULATIVES BOOK
摘要
<p>Livre qui possède au moins un encart à volet doté d'une plaque métallique qui est destinée à aider l'utilisateur à placer ou à disposer des pièces magnétiques (16) sur une page d'un livre.</p>
申请公布号
WO1998049015(A1)
申请公布日期
1998.11.05
申请号
US1998008770
申请日期
1998.04.28
申请人
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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