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发明名称
RULER FOR OPERATING ADDITION AND SUBSTRACTION FOR CHILDREN
摘要
申请公布号
GR871769(B)
申请公布日期
1987.11.27
申请号
GR19870101769
申请日期
1987.11.19
申请人
GEORGAKOUDAS LAMPROS
发明人
GEORGAKOUDAS LAMPROS
分类号
主分类号
代理机构
代理人
主权项
地址
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