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发明名称
Downhole adjustable bent sub
摘要
申请公布号
GB9825676(D0)
申请公布日期
1999.01.20
申请号
GB19980025676
申请日期
1998.11.25
申请人
TECH 21 LTD
发明人
分类号
主分类号
代理机构
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