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经营范围
发明名称
BORRNINGSAPPARAT
摘要
A drilling apparatus adapted to have a drill string releasably secured thereto and including improved means for selectively locking such a drill string against axial rotation.
申请公布号
SE7708753(L)
申请公布日期
1978.02.10
申请号
SE19770008753
申请日期
1977.08.01
申请人
JOY MFG CO
发明人
BAILEY E A;ORDWAY J F
分类号
E21B19/16;(IPC1-7):E21B17/02
主分类号
E21B19/16
代理机构
代理人
主权项
地址
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