Air compressor, air blow:
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Machine engine gaining momentum
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Stamping press
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Grind metal on a grinding machine in a
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Air blow, Air compressor
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Automatic telephone switch
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Small centrifuge
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Low frequency running engine
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Bottling plant
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Welding transformer, working,, turning on
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Conveyor belt, Conveyor
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Power station turbine
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Room noise, Glass bottles on a conveyor line
★★★★★