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发明名称
Teaching device
摘要
申请公布号
US2539077(A)
申请公布日期
1951.01.23
申请号
US19460694296
申请日期
1946.08.31
申请人
HAWKINS BARBARA J
发明人
HAWKINS BARBARA J.
分类号
G09B7/06
主分类号
G09B7/06
代理机构
代理人
主权项
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