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发明名称
Educational device
摘要
申请公布号
US3171216(A)
申请公布日期
1965.03.02
申请号
US19610159853
申请日期
1961.12.18
申请人
THE GEORGE F. CRAM COMPANY, INC.
发明人
DOUTHIT LOREN B.;SAGE ELIZABETH G.
分类号
G09B23/30
主分类号
G09B23/30
代理机构
代理人
主权项
地址
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