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发明名称
Educational device
摘要
申请公布号
US2467051(A)
申请公布日期
1949.04.12
申请号
US19470757610
申请日期
1947.06.27
申请人
REFFNER MARY W
发明人
REFFNER MARY W.
分类号
G09B1/24
主分类号
G09B1/24
代理机构
代理人
主权项
地址
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