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发明名称
METHOD AND APPARATUS FOR USING MULTIPLE PURCHASE LEVELS IN ELECTRONIC COMMERCE
摘要
申请公布号
WO2000079417(A2)
申请公布日期
2000.12.28
申请号
US2000017027
申请日期
2000.06.21
申请人
发明人
分类号
主分类号
代理机构
代理人
主权项
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