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发明名称
Mathematics teaching device
摘要
申请公布号
US3402482(A)
申请公布日期
1968.09.24
申请号
US19660600126
申请日期
1966.12.08
申请人
JOANNE S. RANKIN
发明人
RANKIN JOANNE S.
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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