Machine engine gaining momentum:
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Small centrifuge
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Notches, print imprinted in cardboard
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Milling machine
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Lowers forks, Forklift raises
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Signal for lunch at the factory
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Noise in, Grind wood with a grinder
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Air compressor, air blow
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Robotic assembly line
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The atmosphere of the factory, rattling
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Letter press
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Electric generator (hum)
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Oil pump
★★★★★