Mechanical lift:
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Postal sorting line
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Electric generator (hum)
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Air blow, Air compressor
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Start, run, Compressor, shutdown
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Signal for lunch at the factory
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Brewing unit, mill for grinding grain
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Lathe turning on, stop, work
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Factory Atmosphere
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Breakdown press
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Forklift drives by
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Low frequency running engine
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Industrial exhaust fan
★★★★★