Air is let through the regulator:
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Air compressor operation
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Balloon descent
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Air release with a loud whistling creak,
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Fighting the fire with blacksmith furs
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Rope torsion
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The release of, The work of oxygen equipment
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Truck Air Brakes
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Small compressor blowing air
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Steam
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Blower, air broom
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Wind tunnel ventilation
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Air is let through the regulator
★★★★★