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发明名称
Arithmetic game
摘要
申请公布号
US2937874(A)
申请公布日期
1960.05.24
申请号
US19590801866
申请日期
1959.03.25
申请人
ALFRED ELLISON
发明人
ELLISON ALFRED
分类号
A63F9/20;G09B19/02
主分类号
A63F9/20
代理机构
代理人
主权项
地址
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