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发明名称
Dual purpose borehole sub
摘要
申请公布号
GB9821632(D0)
申请公布日期
1998.11.25
申请号
GB19980021632
申请日期
1998.10.06
申请人
BUYERS, MARK;FORSYTH, DAVID;FRASER, SIMON B
发明人
分类号
E21B34/10;E21B37/06;E21B41/02;E21B47/06
主分类号
E21B34/10
代理机构
代理人
主权项
地址
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