Balloon descent:
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Truck Air Brakes
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Wind tunnel ventilation
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Air is let through the regulator
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Balloon descent
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The release of, The work of oxygen equipment
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Helium balloon
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Air release with a loud whistling creak,
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Cut through the air with a gas burner
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Air compressor, air bleed, cylinder pressure
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Small compressor blowing air
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Steam
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Air compressor operation
★★★★★