Brewing unit, fluid drilling:
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Milling machine
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Working,, Welding transformer, turning on
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Gas welding
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Air compressor turn on, turn off
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Spectrograph
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Stamping press
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Off, Forklift, standby, on
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Canning machine
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Mill for grinding grain, Brewing unit
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Electric generator (hum)
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Glass bottles on a conveyor line, room noise
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Automatic telephone switch
★★★★★