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发明名称
roller coaster for educational materials
摘要
申请公布号
KR20130004068(U)
申请公布日期
2013.07.04
申请号
KR20110011566U
申请日期
2011.12.26
申请人
发明人
分类号
G09B19/00;G09B23/06
主分类号
G09B19/00
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代理人
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