Electric generator (hum):
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Welding transformer operation under load
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Factory Atmosphere
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Stitching machine
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Air compressor turn on, turn off
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Rattling, The atmosphere of the factory
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Drone in a mine tunnel, Factory atmosphere
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Noise in, Grind wood with a grinder
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Heidelberian sorting printer
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Power station turbine
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Signal for lunch at the factory
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Power Plant Water Pumps
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Factory work, general noise
★★★★★