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发明名称
METHOD FOR STEERING A DRILL BIT WHILE DRILLING A BORE HOLE
摘要
申请公布号
EP0772724(A1)
申请公布日期
1997.05.14
申请号
EP19950929699
申请日期
1995.07.25
申请人
SIDEKICK TOOLS INC.
发明人
GRAY, BENJAMIN
分类号
E21B7/06;(IPC1-7):E21B7/06
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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