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发明名称
DOWNHOLE TOOL
摘要
申请公布号
GB0822491(D0)
申请公布日期
2009.01.14
申请号
GB20080022491
申请日期
2008.12.10
申请人
NATIONAL OILWELL VARCO, L.P.
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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