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发明名称
The way of make the study materials using a smartphone and QR-code
摘要
申请公布号
KR20130004494(U)
申请公布日期
2013.07.22
申请号
KR20110010915U
申请日期
2011.12.08
申请人
发明人
分类号
G06K9/18;G06Q50/20
主分类号
G06K9/18
代理机构
代理人
主权项
地址
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