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经营范围
发明名称
DRILLING METHOD AND CASING SHOE
摘要
申请公布号
EP0842345(A1)
申请公布日期
1998.05.20
申请号
EP19950932261
申请日期
1995.08.03
申请人
SVENSKA BORR AB
发明人
EDMAN, OESTEN
分类号
E21B7/20;E21B17/08;E21B17/14;(IPC1-7):E21B7/20
主分类号
E21B7/20
代理机构
代理人
主权项
地址
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