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auxiliary ventilation

A method of supplementing the main ventilating current in a mine by using a small fan to draw air from the main current and force it through canvas or metal pipe to some particular place, such as the ends of drifts, crosscuts, raises, entries, or other workings driven in a mine.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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