Air is let through the regulator:
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Blower, air broom
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Cylinder pressure, air bleed, Air compressor
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Air pressure
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Air is bleeding through a hose
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Fighting the fire with blacksmith furs
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Balloon inflating
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Mask breathing
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A stream of air breaks out of a metal pipe
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Helium balloon
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Rope torsion
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The work of oxygen equipment, the release of
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Compressor discharges air, Construction
★★★★★