Industrial exhaust fan:
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Low frequency running engine
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The atmosphere of the factory, rattling
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Welding transformer operation under load
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Stitching machine
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Generator, work, jamming, start
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Electric welding
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Spectrograph
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Power station generator
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Steam pump
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General noise, Factory work
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Air compressor, air blow
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Loaders, general noise, Work in a warehouse
★★★★★