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It is a mechanical device that will help in suspending the weight of the drill string(https://is. gd/oS0wMi). It also allows the drill string beneath r (more)

It is a mechanical device that will help in suspending the weight of the drill string(https://is.gd/oS0wMi). It also allows the drill string beneath rotation. It also conveys the high–pressure drilling mud volume that is between the rig’s circulation systems.

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