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发明名称
Improved apparatus for teaching calculations to children and for like purposes
摘要
申请公布号
GB359210(A)
申请公布日期
1931.10.22
申请号
GB19300031757
申请日期
1930.10.22
申请人
SARAH WEAVER STEPHENS
发明人
分类号
G09B19/02
主分类号
G09B19/02
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