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经营范围
发明名称
METHOD OF DRILLING A BOREHOLE
摘要
申请公布号
EP0227193(B1)
申请公布日期
1992.06.24
申请号
EP19860202313
申请日期
1986.12.17
申请人
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
发明人
STEWART, ROBERT BRUCE
分类号
E21B21/12
主分类号
E21B21/12
代理机构
代理人
主权项
地址
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