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发明名称
DREHBOHRMEISSEL.
摘要
申请公布号
DE3585002(D1)
申请公布日期
1992.02.06
申请号
DE19853585002
申请日期
1985.07.29
申请人
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V., DEN HAAG/S'GRAVENHAGE, NL
发明人
ZIJSLING, DJURRE HANS, NL-2288 GD RIJSWIJK, NL
分类号
E21B10/60;E21B21/00;(IPC1-7):E21B21/00
主分类号
E21B10/60
代理机构
代理人
主权项
地址
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