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发明名称
Device for teaching number concepts
摘要
申请公布号
US3002295(A)
申请公布日期
1961.10.03
申请号
US19580769769
申请日期
1958.10.27
申请人
LEE ARMSTRONG VERNON
发明人
ARMSTRONG VERNON LEE
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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