Automatic telephone switch:
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Room noise, Glass bottles on a conveyor line
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Noise in, Grind wood with a grinder
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Stamping press
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Turn off, Air compressor turn on
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Brewing unit, mill for grinding grain
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Low frequency running engine
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Conveyor belt, Conveyor
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Letter press
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Power Plant Water Pumps
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Canning machine
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Jamming, start, work, Generator
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Printing press
★★★★★