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经营范围
发明名称
Anti-whirl drilling improvement
摘要
申请公布号
AUPP020497(D0)
申请公布日期
1997.11.27
申请号
AU1997PP00204
申请日期
1997.11.04
申请人
GEARHART AUSTRALIA LTD.
发明人
分类号
E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
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