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发明名称
Teaching aid for arithmetic
摘要
申请公布号
GB9925244(D0)
申请公布日期
1999.12.29
申请号
GB19990025244
申请日期
1999.10.27
申请人
OPPENHEIM, MICHAEL J
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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