Grind wood with a grinder, noise in production:
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Spinning machine
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Electric generator (hum)
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Hydraulic down machine
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Automatic telephone switch
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Hammer knocking, welding, Car factory
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Bottling plant
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Loaders, general noise, Work in a warehouse
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Low frequency running engine
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Newspaper press
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Power Plant Water Pumps
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Box making machine
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Room noise, Glass bottles on a conveyor line
★★★★★