Machine engine gaining momentum:
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Stop, Lathe turning on, work
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Print imprinted in cardboard, Notches
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Working machine engine
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Generator, work, jamming, start
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Milling machine
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Hydraulic pump
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Electric generator (hum)
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Noise in, Grind wood with a grinder
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Canning machine
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Robotic assembly line
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Welding, hammer knocking, Car factory
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Electric industrial motor
★★★★★