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发明名称
Teaching devices
摘要
申请公布号
GB637327(A)
申请公布日期
1950.05.17
申请号
GB19480023981
申请日期
1947.08.29
申请人
BARBARA JEAN HAWKINS
发明人
分类号
G09B7/06
主分类号
G09B7/06
代理机构
代理人
主权项
地址
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