Brewing unit, mill for grinding grain:
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Low frequency running engine
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Working machine engine
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Rattling, The atmosphere of the factory
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Spectrograph
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Conveyor belt, Conveyor
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Letter press
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Heidelberian sorting printer
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Jamming, start, work, Generator
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Drone in a mine tunnel, Factory atmosphere
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Electric generator (hum)
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Power station generator
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Power station turbine
★★★★★