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发明名称
Device for teaching arithmetic
摘要
申请公布号
US2560130(A)
申请公布日期
1951.07.10
申请号
US19470792438
申请日期
1947.12.18
申请人
RUSSO MATTHEW J
发明人
RUSSO MATTHEW J.
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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