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发明名称
Visual instruction aids
摘要
申请公布号
US2867045(A)
申请公布日期
1959.01.06
申请号
US19560608369
申请日期
1956.09.06
申请人
MILLGATE IRVINE H
发明人
MILLGATE IRVINE H.
分类号
G09B5/02
主分类号
G09B5/02
代理机构
代理人
主权项
地址
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