Signal for lunch at the factory:
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Lowers forks, Forklift raises
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Heidelberian sorting printer
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Car factory
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Industrial exhaust fan
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Lathe turning on, stop, work
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Turn off, Air compressor turn on
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Power station generator
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Noise in, Grind wood with a grinder
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Machine engine gaining momentum
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Spectrograph
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Shutdown, start, Compressor, run
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Spinning machine
★★★★★