Forklift approaching:
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Low frequency running engine
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Electric generator (hum)
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Stamping press
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Circular knitting machine
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Notches, print imprinted in cardboard
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Automatic telephone switch
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Noise in, Grind wood with a grinder
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Gas welding
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Glass bottles on a conveyor line, room noise
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Car factory
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Electric industrial motor
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Conveyor belt, Conveyor
★★★★★