Wind tunnel ventilation:
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The release of, The work of oxygen equipment
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Air compressor, air bleed, cylinder pressure
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Air is bleeding through a hose
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Small compressor blowing air
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Oxygen balloon
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Air is blown through a glass tube
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Steam
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Fighting the fire with blacksmith furs
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Balloon descent
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Air pressure
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Helium balloon
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Air is let through the regulator
★★★★★