Rope torsion:
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Air is let through the regulator
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Truck Air Brakes
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Balloon descent
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Soccer ball
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Fighting the fire with blacksmith furs
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Cut through the air with a gas burner
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Compressor discharges air, Construction
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Inflating a mattress
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Rope torsion
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Balloon inflating
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Helium balloon
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The release of, The work of oxygen equipment
★★★★★