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Irrigation Dictionary : Table of Contents (members login required)\t
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4335. Kelly, or Grief stem : The uppermost joint of the drill string, square or hexagonal in cross-section, rather than circular, which permits the string to be rotated by the rotary table and at the same time to move downward as the bore is deepened.

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4335. Tige d`entraînement : Elément d`articulation à l`extrémité supérieure de la tige de forage, dont coupe transversale est de forme carrée ou hexagonale plutôt que circulaire qui fait tourner le câble de forage grâce à la table de rotation, et permet son déplacement vers le fond du puits.

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