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bottom-discharge bit

A bit designed for drilling in soft formations and for use on a double-tube core barrel, the inner tube of which fits snugly into a recess cut into the inside wall of the bit directly above the inside reaming stones. The bit is provided with a number of holes drilled longitudinally through the wall of the bit, through which the circulation liquid flows and is ejected at the cutting face of the bit.

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创建者

  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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