Electric generator (hum):
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Hydraulic down machine
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Spectrograph
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Fluid drilling, Brewing unit
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Factory atmosphere, drone in a mine tunnel
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Work, start, jamming, Generator
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Heidelberian sorting printer
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Small centrifuge
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Welding transformer operation under load
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Laser welding
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Forklift in motion
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Noise in, Grind wood with a grinder
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Automatic telephone switch
★★★★★