Hydraulic pump:
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Rattling, The atmosphere of the factory
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Welding transformer operation under load
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Air blow, Air compressor
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General noise, Factory work
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Brewing unit, mill for grinding grain
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Lathe turning on, work, stop
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Small centrifuge
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Working machine engine
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Power station generator
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Hydraulic activator
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Postal sorting line
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Automatic telephone switch
★★★★★