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发明名称
A UNIVERSAL CARD SET FOR ILLUSTRATING ADDITION,SUBTRACTION,MULTIPLICATION AND DIVISION
摘要
申请公布号
GB2257814(B)
申请公布日期
1994.12.07
申请号
GB19910015613
申请日期
1991.07.19
申请人
YEH * KANT
发明人
YEH * KANT
分类号
G09B1/12;G09B3/04;G09B19/02;(IPC1-7):G09B1/12
主分类号
G09B1/12
代理机构
代理人
主权项
地址
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