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发明名称
Educational device
摘要
申请公布号
GB1003387(A)
申请公布日期
1965.09.02
申请号
GB19640013758
申请日期
1964.04.02
申请人
BARBARA JEAN HAWKINS
发明人
分类号
G09B3/06
主分类号
G09B3/06
代理机构
代理人
主权项
地址
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