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发明名称
EDUCATIONAL APPARATUS
摘要
申请公布号
US3575545(A)
申请公布日期
1971.04.20
申请号
USD3575545
申请日期
1968.11.25
申请人
ARCHIBALD MILLAR
发明人
ARCHIBALD MILLAR
分类号
G09B7/06;(IPC1-7):G09B7/06
主分类号
G09B7/06
代理机构
代理人
主权项
地址
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