Newspaper press:
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Air compressor, air blow
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Dry cleaning
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Conveyor belt, Conveyor
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Car factory, welding, hammer knocking
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Automatic telephone switch
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Noise in, Grind wood with a grinder
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Low frequency running engine
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Start, run, Compressor, shutdown
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Working machine engine
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Electric welding
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Electric generator (hum)
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Power Plant Water Pumps
★★★★★