Spectrograph:
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Forklift raises, lowers forks
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Mechanical lift
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Conveyor, conveyor belt
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Printing press
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Machine engine gaining momentum
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Glass bottles on a conveyor line, room noise
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Grind wood with a grinder, noise in
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Automatic telephone switch
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Fluid drilling, Brewing unit
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Newspaper press
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Laser welding
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Welding, hammer knocking, Car factory
★★★★★