Laser welding:
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Welding, hammer knocking, Car factory
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Rattling, The atmosphere of the factory
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Electric generator (hum)
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Electric industrial motor
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Air compressor turn on, turn off
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Spinning machine
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Stamping press
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Automatic folder
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Room noise, Glass bottles on a conveyor line
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Compressor, run, shutdown, start
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Postal sorting line
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Low frequency running engine
★★★★★