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发明名称
Mathematical instruction means
摘要
申请公布号
US3314168(A)
申请公布日期
1967.04.18
申请号
US19640362427
申请日期
1964.04.24
申请人
JANE HECKMAN MARTHA
发明人
HECKMAN MARTHA JANE
分类号
A63F9/12;G09B19/02
主分类号
A63F9/12
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