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发明名称
System and method for exchanging coupons using video call
摘要
申请公布号
KR101084774(B1)
申请公布日期
2011.11.21
申请号
KR20080116093
申请日期
2008.11.21
申请人
发明人
分类号
H04W4/20;H04W4/00
主分类号
H04W4/20
代理机构
代理人
主权项
地址
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