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发明名称
Apparatus for teaching division by fractions
摘要
申请公布号
US3204344(A)
申请公布日期
1965.09.07
申请号
US19630295882
申请日期
1963.07.18
申请人
MCMEEN GEORGE H
发明人
MCMEEN GEORGE H.
分类号
G09B23/04
主分类号
G09B23/04
代理机构
代理人
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地址
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