Welding transformer, turning on, working, turning off:
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Laser welding
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Newspaper press
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Car factory, hammer knocking, welding
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Working machine engine
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Box making machine
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Electric industrial motor
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Room noise, Glass bottles on a conveyor line
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Industrial exhaust fan
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Hydraulic machine up
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Stop, work, Lathe turning on
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Automatic telephone switch
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Air compressor, air blow
★★★★★