Air pressure:
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Air compressor operation
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Air is bleeding through a hose
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Air release with a loud whistling creak,
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Steam
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Suction action of air
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Air is let through the regulator
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Rope torsion
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A stream of air breaks out of a metal pipe
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The work of oxygen equipment, the release of
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Fighting the fire with blacksmith furs
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Oxygen balloon
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Compressor discharges air, Construction
★★★★★