Factory atmosphere, drone in a mine tunnel:
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Spectrograph
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Power station generator
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Newspaper press
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Heidelberian sorting printer
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Work, Generator, jamming, start
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Low frequency running engine
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Grind metal on a grinding machine in a
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Small centrifuge
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Turning on, working,, Welding transformer
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Canning machine
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Lithographic press
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Welding transformer operation under load
★★★★★