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发明名称
A teaching aid to illustrate mathematical principles
摘要
申请公布号
GB2248715(A)
申请公布日期
1992.04.15
申请号
GB19900021974
申请日期
1990.10.09
申请人
LENVAL ALAN * CALLENDER
发明人
LENVAL ALAN * CALLENDER
分类号
G09B23/04
主分类号
G09B23/04
代理机构
代理人
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