Box making machine:
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Bottling plant
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Air compressor, air blow
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Forklift drives by
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Power station turbine
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Signal for lunch at the factory
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Automatic telephone switch
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Postal sorting line
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Welding transformer operation under load
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Glass bottles on a conveyor line, room noise
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Rattling, The atmosphere of the factory
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Mechanical lift
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Spectrograph
★★★★★