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发明名称
摘要
申请公布号
NO132766(C)
申请公布日期
1976.01.07
申请号
NO19710003308
申请日期
1971.09.06
申请人
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ NV
发明人
MARSHALL P W;ARNOLD P;DUNN F P
分类号
E21B7/04;E21B15/04;E21B43/01;(IPC1-7):E02B17/00;E21B15/02
主分类号
E21B7/04
代理机构
代理人
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