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发明名称
Educational device
摘要
申请公布号
US3106787(A)
申请公布日期
1963.10.15
申请号
US19610114489
申请日期
1961.06.02
申请人
DOUGLAS COLLINS ROBERT
发明人
COLLINS ROBERT DOUGLAS
分类号
G09B23/34
主分类号
G09B23/34
代理机构
代理人
主权项
地址
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