Hydraulic pump:
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Postal sorting line
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Low frequency running engine
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Turn off, Air compressor turn on
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Stitching machine
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The atmosphere of the factory, rattling
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Automatic telephone switch
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Air blow, Air compressor
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Factory work, general noise
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Grind metal on a grinding machine in a
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Hammer knocking, welding, Car factory
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Loaders, general noise, Work in a warehouse
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Working,, turning on, Welding transformer
★★★★★