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1.Drive and feed device for a string of rotary drill string elements 失效
Title translation: 用于一系列旋转钻柱元件的驱动和进给装置公开(公告)号:US3190370A
公开(公告)日:1965-06-22
申请号:US18804462
申请日:1962-04-17
Applicant: ATLAS COPCO AB
Inventor: GUNNAR KVELLO-AUNE ALF , FREDRIK TROFTEN PER
CPC classification number: E21B21/00 , E21B3/02 , E21B7/022 , E21B19/08 , Y10T279/17743
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公开(公告)号:US3131776A
公开(公告)日:1964-05-05
申请号:US85494259
申请日:1959-11-23
Applicant: ATLAS COPCO AB
Inventor: GUNNAR KVELLO-AUNE ALF , FREDRIK TROFTEN PER
IPC: E21B19/08
CPC classification number: E21B19/08
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