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发明名称
Mathematics teaching device
摘要
申请公布号
US3405460(A)
申请公布日期
1968.10.15
申请号
US19660560028
申请日期
1966.05.17
申请人
SYLVIA MICHAELSON
发明人
MICHAELSON SYLVIA
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
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