Spectrograph:
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Dry cleaning
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Box making machine
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Glass bottles on a conveyor line, room noise
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Low frequency running engine
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Spectrograph
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Car factory
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Noise in, Grind wood with a grinder
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Forklift truck moving away
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Factory atmosphere, drone in a mine tunnel
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Compressor, start, shutdown, run
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Stitching machine
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Working machine engine
★★★★★