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发明名称
Device for teaching division
摘要
申请公布号
US1818566(A)
申请公布日期
1931.08.11
申请号
US19300417851
申请日期
1930.01.02
申请人
MCDADE JAMES E
发明人
MCDADE JAMES E.
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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