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发明名称
TEACHING AID
摘要
申请公布号
EP0125836(A3)
申请公布日期
1986.07.02
申请号
EP19840302962
申请日期
1984.05.02
申请人
O'MALLEY, ARTHUR ROBERT
发明人
O'MALLEY, ARTHUR ROBERT
分类号
G06C1/00;G09B19/02;(IPC1-7):G09B19/02
主分类号
G06C1/00
代理机构
代理人
主权项
地址
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