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发明名称
STIGEROERLEDNING MED FLEKSIBEL FORSTERKNING.
摘要
申请公布号
NO156619(B)
申请公布日期
1987.07.13
申请号
NO19800002671
申请日期
1980.09.10
申请人
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
发明人
GRAAF, GERHARDUS CORNELIS VAN DER
分类号
E21B17/01;E21B43/017;(IPC1-7):E21B17/01
主分类号
E21B17/01
代理机构
代理人
主权项
地址
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