Gas welding:
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Robotic assembly line
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Air compressor turn on, turn off
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Low frequency running engine
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Welding transformer, turning on, working,
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Compressor industry
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Conveyor belt, Conveyor
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Hydraulic down machine
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Mechanical lift
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Factory Atmosphere
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Circular knitting machine
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Stop, work, Lathe turning on
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Rattling, The atmosphere of the factory
★★★★★