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发明名称
An improved teaching aid
摘要
申请公布号
GB9807571(D0)
申请公布日期
1998.06.10
申请号
GB19980007571
申请日期
1998.04.09
申请人
HARRISON, DALE M
发明人
分类号
G09B1/32;G09B17/00
主分类号
G09B1/32
代理机构
代理人
主权项
地址
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