Air-power-operated mine door

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Mine doors help to keep the air flow in shafts and mine working areas constant. In cases of explosions, doors "give" to relieve the pressure, then close automatically. The doors are mobile and can be set up in any location. They are opened and closed by a compressed-air cylinder and are designed to be used where haulage equipment operates on a trolley wire. Best, 1
Source: Dictionary of Mining, Mineral, and Related Terms

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