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发明名称
FREMGANGSMAATE OG ANORDNING FOR BORING AV EN RETT BROENNBORING.
摘要
申请公布号
NO893604(A)
申请公布日期
1990.06.28
申请号
NO19890003604
申请日期
1989.09.08
申请人
CLAYTON, CHARLES H.
发明人
CLAYTON, CHARLES H.
分类号
E21B7/04;E21B17/10;E21B17/22;(IPC1-7):E21B17/10
主分类号
E21B7/04
代理机构
代理人
主权项
地址
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