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发明名称
Method and device for modifying the weight on an earth drill bit
摘要
申请公布号
EP0469317(B1)
申请公布日期
1997.12.29
申请号
EP19910110976
申请日期
1991.07.03
申请人
BAKER-HUGHES INCORPORATED
发明人
JUERGENS, RAINER, DR.-ING.;MAKOHL, FRIEDHELM
分类号
E21B7/06;E21B17/07;E21B21/08;E21B44/00;(IPC1-7):E21B44/00
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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