Oxygen balloon:
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Air flow
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Inflating a mattress
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Fighting the fire with blacksmith furs
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Air is bleeding through a hose
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Compressor discharges air, Construction
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Air is blown through a glass tube
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Air is let through the regulator
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Air compressor operation
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Air bleed, cylinder pressure, Air compressor
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Helium balloon
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Soccer ball
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The work of oxygen equipment, the release of
★★★★★