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发明名称
LECTURE SYSTEM USING PORTABLE DEVICE AND METHOD THEREOF
摘要
申请公布号
KR100686522(B1)
申请公布日期
2007.02.26
申请号
KR20050025641
申请日期
2005.03.28
申请人
发明人
分类号
G06Q50/20
主分类号
G06Q50/20
代理机构
代理人
主权项
地址
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