Industrial exhaust fan:
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Breakdown press
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Printing press
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Stitching machine
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Room noise, Glass bottles on a conveyor line
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Small centrifuge
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Newspaper press
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Canning machine
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Noise in, Grind wood with a grinder
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Electric generator (hum)
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Power station generator
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Mill for grinding grain, Brewing unit
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Factory atmosphere, drone in a mine tunnel
★★★★★