Mask breathing:
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Air compressor operation
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Balloon descent
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Oxygen balloon
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Air is let through the regulator
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Air is bleeding through a hose
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The release of, The work of oxygen equipment
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Wind tunnel ventilation
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Balloon inflating
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A stream of air breaks out of a metal pipe
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Construction, compressor discharges air
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Rope torsion
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Helium balloon
★★★★★