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发明名称
TEACHING EQUIPMENT
摘要
申请公布号
GB8611652(D0)
申请公布日期
1986.06.18
申请号
GB19860011652
申请日期
1986.05.13
申请人
COCKBURN, J
发明人
分类号
G09B17/00
主分类号
G09B17/00
代理机构
代理人
主权项
地址
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