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发明名称
Educational device presenting pictorial and numerical problems
摘要
申请公布号
US2645038(A)
申请公布日期
1953.07.14
申请号
US19510258122
申请日期
1951.11.26
申请人
MERRILL ALBERT H
发明人
MERRILL ALBERT H.
分类号
G09B17/00
主分类号
G09B17/00
代理机构
代理人
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