Postal sorting line:
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Factory Atmosphere
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Stop, work, Lathe turning on
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Forklift in motion
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General noise, loaders, Work in a warehouse
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Industrial exhaust fan
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Steam pump
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Air compressor turn on, turn off
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Laser welding
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Start, jamming, work, Generator
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Electric industrial motor
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Start, Compressor, shutdown, run
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Automatic telephone switch
★★★★★