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main separation door

A wooden or steel door erected near the pit bottom to prevent the intake air leaking into the main return airway or upcast shaft; a door to direct the main intake air in toward the workings. It may be fitted with an appliance, or shutter, to ease the opening for traveling purposes.

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创建者

  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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