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hollow-rod churn drill

A churn drill in which hollow rods replace the steel wire rope. The drilling fluid is pumped down the inside of the rods, and the chipping and fluid return to the surface on the outside.

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Penulis

  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 poin
  • 100% positive feedback
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