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发明名称
A HOLE OPENER DEVICE FOR THE TOP HOLE SECTION OF OIL/GAS WELLS
摘要
申请公布号
GB9303057(D0)
申请公布日期
1993.03.31
申请号
GB19930003057
申请日期
1993.02.16
申请人
KVERNELAND KLEPP AS
发明人
分类号
E21B7/28;E21B10/16;E21B10/20;E21B10/24;E21B10/26;E21B10/28;E21B17/10;F16B21/12
主分类号
E21B7/28
代理机构
代理人
主权项
地址
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