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经营范围
发明名称
Hand-held addition and subtraction trainer
摘要
申请公布号
KR20070020707(A)
申请公布日期
2007.02.22
申请号
KR20050074901
申请日期
2005.08.16
申请人
发明人
分类号
G06F15/02;G06Q99/00
主分类号
G06F15/02
代理机构
代理人
主权项
地址
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