Postal sorting line:
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Welding transformer, turning on, working,
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Rattling, The atmosphere of the factory
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Factory atmosphere, drone in a mine tunnel
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Low frequency running engine
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Welding transformer operation under load
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Dry cleaning
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Stop, Lathe turning on, work
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Forklift approaching
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Power station turbine
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Air blow, Air compressor
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Steam pump
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Spectrograph
★★★★★