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发明名称
Educational device
摘要
申请公布号
US3314169(A)
申请公布日期
1967.04.18
申请号
US19640420670
申请日期
1964.12.23
申请人
WOLD JOSEPH C
发明人
WOLD JOSEPH C.
分类号
G09B23/04
主分类号
G09B23/04
代理机构
代理人
主权项
地址
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