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发明名称
Educational device
摘要
申请公布号
US3318023(A)
申请公布日期
1967.05.09
申请号
US19650428489
申请日期
1965.01.27
申请人
MYERS RAYMOND M
发明人
MYERS RAYMOND M.
分类号
G09B17/00
主分类号
G09B17/00
代理机构
代理人
主权项
地址
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