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发明名称
Arithmetic teaching device
摘要
申请公布号
US1992366(A)
申请公布日期
1935.02.26
申请号
US19320619363
申请日期
1932.06.27
申请人
FISHER JOSEPH B
发明人
FISHER JOSEPH B.
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
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