Air compressor turn on, turn off:
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Turning on, Welding transformer, working,
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Small centrifuge
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Power Plant Water Pumps
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Automatic telephone switch
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Room noise, Glass bottles on a conveyor line
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Steam pump
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Dry cleaning
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Box making machine
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Power station generator
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Welding, hammer knocking, Car factory
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Circular knitting machine
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Air compressor, air blow
★★★★★