Low frequency running engine:
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Lithographic press
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Breakdown press
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Grind metal on a grinding machine in a
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Work, stop, Lathe turning on
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Automatic folder
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Laser welding
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Work, jamming, Generator, start
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Loaders, Work in a warehouse, general noise
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Industrial exhaust fan
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Circular knitting machine
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Notches, print imprinted in cardboard
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Electric generator (hum)
★★★★★