Spectrograph:
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Postal sorting line
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Power Plant Water Pumps
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Stitching machine
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Welding transformer operation under load
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Gas welding
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Welding, Car factory, hammer knocking
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Automatic telephone switch
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Air compressor turn on, turn off
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Newspaper press
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Forklift drives by
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Lithographic press
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Grind metal on a grinding machine in a
★★★★★
