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经营范围
发明名称
DRILLING CENTRALIZER
摘要
申请公布号
KR100554716(B1)
申请公布日期
2006.02.24
申请号
KR20030068070
申请日期
2003.09.30
申请人
发明人
分类号
E21C50/00
主分类号
E21C50/00
代理机构
代理人
主权项
地址
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