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发明名称
Mathematics instructing device
摘要
申请公布号
US3339295(A)
申请公布日期
1967.09.05
申请号
US19650456131
申请日期
1965.05.17
申请人
WANVIG WILLARD J
发明人
WANVIG WILLARD J.
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
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地址
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