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经营范围
发明名称
Arithmetic teaching aid to demonstrate fractions
摘要
申请公布号
US2914865(A)
申请公布日期
1959.12.01
申请号
US19580763601
申请日期
1958.09.26
申请人
HALL MARY H
发明人
HALL MARY H.
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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