Low frequency running engine:
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The atmosphere of the factory, rattling
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Conveyor, conveyor belt
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Milling machine
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Signal for lunch at the factory
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Brewing unit, mill for grinding grain
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Stitching machine
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Small centrifuge
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Power station generator
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Generator, work, jamming, start
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Glass bottles on a conveyor line, room noise
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Notches, print imprinted in cardboard
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Welding transformer operation under load
★★★★★