Industrial exhaust fan:
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Gas welding
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Low frequency running engine
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General noise, loaders, Work in a warehouse
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Robotic assembly line
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Machine engine gaining momentum
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Canning machine
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Spectrograph
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Noise in, Grind wood with a grinder
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Laser welding
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Brewing unit, fluid drilling
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Electric welding
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Drone in a mine tunnel, Factory atmosphere
★★★★★