Spectrograph:
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Factory atmosphere, drone in a mine tunnel
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Lowers forks, Forklift raises
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Printing press
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Automatic telephone switch
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Mill for grinding grain, Brewing unit
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Brewing unit, fluid drilling
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Electric welding
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Gas welding
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Turn off, Air compressor turn on
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Grind metal on a grinding machine in a
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Notches, print imprinted in cardboard
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Low frequency running engine
★★★★★