Spectrograph:
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Turn off, Air compressor turn on
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Automatic telephone switch
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Forklift approaching
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Stitching machine
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Factory atmosphere, drone in a mine tunnel
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General noise, loaders, Work in a warehouse
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Steam pump
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Hydraulic machine up
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Machine engine gaining momentum
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Welding transformer, turning on, working,
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Hydraulic down machine
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Signal for lunch at the factory
★★★★★