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发明名称
Educational device
摘要
申请公布号
GB9707117(D0)
申请公布日期
1997.05.28
申请号
GB19970007117
申请日期
1997.04.08
申请人
INNOVISION RESEARCH AND TECHNOLOGY LIMITED
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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