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经营范围
发明名称
An improved abacus
摘要
申请公布号
KR200383018(Y1)
申请公布日期
2005.04.28
申请号
KR20050003128U
申请日期
2005.02.02
申请人
发明人
分类号
G06C1/00;(IPC1-7):G06C1/00
主分类号
G06C1/00
代理机构
代理人
主权项
地址
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