Working machine engine:
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Machine engine gaining momentum
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Hammer knocking, welding, Car factory
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Robotic assembly line
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Off, on, standby, Forklift
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Vibrosieve at the factory
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Brewing unit, fluid drilling
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Air compressor turn on, turn off
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Start, shutdown, Compressor, run
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Spectrograph
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Working,, Welding transformer, turning on
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Lithographic press
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Working machine engine
★★★★★