- drill string steering unit
- 钻杆: bull rod; bar; rod; drill st ...
- 转向装置: transfer; steering gear
- 横转向装置: cro steering device; cross steering device
- 双转向装置: twin-steer
- 转向装置: edflector; side winder; steerage gear; steering apparatus; steering device; steering equipment; steering gear; steering mechanism; wagon steering
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