Air compressor turn on, turn off:
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Low frequency running engine
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Mill for grinding grain, Brewing unit
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Book press
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Power station generator
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Printing press
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Room noise, Glass bottles on a conveyor line
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Postal sorting line
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Heidelberian sorting printer
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Power station turbine
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Standby, Forklift, on, off
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Working machine engine
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Lithographic press
★★★★★