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发明名称
Educational device for teaching spelling and arithmetic
摘要
申请公布号
US2884714(A)
申请公布日期
1959.05.05
申请号
US19540452844
申请日期
1954.08.30
申请人
LAWRENCE MARION D
发明人
LAWRENCE MARION D.
分类号
G09B17/00
主分类号
G09B17/00
代理机构
代理人
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