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发明名称
Acoustically coupled drill pipe connections
摘要
申请公布号
GB2284029(A)
申请公布日期
1995.05.24
申请号
GB19930023397
申请日期
1993.11.12
申请人
* GEC-MARCONI LIMITED
发明人
DAVID * SMALL
分类号
E21B17/042;E21B47/16;(IPC1-7):E21B17/042
主分类号
E21B17/042
代理机构
代理人
主权项
地址
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