Hydraulic down machine:
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Letter press
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On, Forklift, off, standby
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Conveyor, conveyor belt
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Low frequency running engine
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Oil pump
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Automatic folder
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Welding transformer operation under load
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Factory work, general noise
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Welding, hammer knocking, Car factory
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Drone in a mine tunnel, Factory atmosphere
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Brewing unit, mill for grinding grain
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Gas welding
★★★★★