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发明名称
Teaching tools using piezoelectric element
摘要
申请公布号
KR20140004677(U)
申请公布日期
2014.08.14
申请号
KR20130000919U
申请日期
2013.02.05
申请人
发明人
分类号
G09B23/18;H01L41/00
主分类号
G09B23/18
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代理人
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