Oil pump:
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Off, on, standby, Forklift
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Automatic telephone switch
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Forklift in motion
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Vibrosieve at the factory
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Welding transformer, turning on, working,
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Notches, print imprinted in cardboard
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Spectrograph
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Shutdown, Compressor, start, run
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Electric generator (hum)
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Compressor industry
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Power station generator
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Working machine engine
★★★★★