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经营范围
发明名称
DRILL SHOE
摘要
申请公布号
GB8525757(D0)
申请公布日期
1985.11.20
申请号
GB19850025757
申请日期
1985.10.18
申请人
BRITISH PETROLEUM CO PLC
发明人
分类号
E21B7/24;E21B7/26;E21B10/02;E21B10/40
主分类号
E21B7/24
代理机构
代理人
主权项
地址
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