Air is blown through a glass tube:
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Fighting the fire with blacksmith furs
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Air is let through the regulator
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Balloon descent
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Cylinder pressure, air bleed, Air compressor
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Air release with a loud whistling creak,
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Air pressure
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Suction action of air
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Air is bleeding through a hose
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Construction, compressor discharges air
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Mask breathing
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Wind tunnel ventilation
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Air compressor operation
★★★★★