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发明名称
TEACHING AID.
摘要
申请公布号
EP0662231(A1)
申请公布日期
1995.07.12
申请号
EP19930920968
申请日期
1993.09.17
申请人
COPELAND, PETER
发明人
COPELAND, PETER
分类号
G09B19/00;(IPC1-7):G09B19/00;G09B5/04;G11B20/10
主分类号
G09B19/00
代理机构
代理人
主权项
地址
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