Air is let through the regulator:
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Balloon descent
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A stream of air breaks out of a metal pipe
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Mask breathing
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The work of oxygen equipment, the release of
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Air bleed, Air compressor, cylinder pressure
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Fighting the fire with blacksmith furs
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Air broom, Blower
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Balloon inflating
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Oxygen balloon
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Air is bleeding through a hose
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Air compressor operation
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Suction action of air
★★★★★