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发明名称
DRILL STRING FINGER COUPLING
摘要
申请公布号
GB8528727(D0)
申请公布日期
1985.12.24
申请号
GB19850028727
申请日期
1985.11.21
申请人
BOTTOMS, C C
发明人
分类号
E21B17/043;E21B17/07;(IPC1-7):E21B17/07
主分类号
E21B17/043
代理机构
代理人
主权项
地址
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