Low frequency running engine:
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Conveyor belt, Conveyor
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Industrial exhaust fan
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Electric welding
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Laser welding
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Grind wood with a grinder, noise in
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General noise, Factory work
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Oil pump
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Bottling plant
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Low frequency running engine
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Print imprinted in cardboard, Notches
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Grind metal on a grinding machine in a
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Heidelberian sorting printer
★★★★★