kelly spinner
Kelly Bushing(方钻杆补心) Kelly Spinner (方钻杆旋转器)
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方钻杆旋转器已经很大程度地替代了旋链,而正是旋链造成了钻台上的大部分伤害事故。
The kelly spinner has largely replaced the infamous spinning chains, which were responsible for numerous injuries on the rig floor.
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