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发明名称
TEACHING DEVICE
摘要
申请公布号
GB8722812(D0)
申请公布日期
1987.11.04
申请号
GB19870022812
申请日期
1987.09.29
申请人
PESTRIDGE, C
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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