Automatic telephone switch:
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Steam pump
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Spinning machine
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Heidelberian sorting printer
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Forklift in motion
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Conveyor belt, Conveyor
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Compressor, shutdown, run, start
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Compressor industry
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Robotic assembly line
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Working machine engine
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Welding transformer, turning on, working,
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Car factory, welding, hammer knocking
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Electric generator (hum)
★★★★★