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发明名称
TEACHING AID
摘要
申请公布号
GB9321066(D0)
申请公布日期
1993.12.01
申请号
GB19930021066
申请日期
1993.10.13
申请人
NERIEUX MAUREEN A.
发明人
分类号
G09B11/00;G09B17/00;G09B23/02
主分类号
G09B11/00
代理机构
代理人
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