| 摘要 |
A knuckle-swivel ( 10 ) is used with well drilling equipment for protecting helical wound line 62 , which may be wire rope, cable and/or strand, against torsional forces and also providing for angular displacement of sinker bars or other tools during wireline strip over operations to minimize interference with rig equipment ( 80 ) when pulling pipe or tools 64 from a well head.
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