Gas welding:
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Air compressor turn on, turn off
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Automatic folder
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Dry cleaning
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Oil pump
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Grind metal on a grinding machine in a
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Working machine engine
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Low frequency running engine
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Forklift drives by
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Circular knitting machine
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Vibrosieve at the factory
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Room noise, Glass bottles on a conveyor line
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Robotic assembly line
★★★★★