Hydraulic down machine:
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Fluid drilling, Brewing unit
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Postal sorting line
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Lathe turning on, stop, work
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Crusher
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Stitching machine
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Machine engine gaining momentum
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Compressor industry
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Rattling, The atmosphere of the factory
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Factory atmosphere, drone in a mine tunnel
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Low frequency running engine
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Letter press
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Turn off, Air compressor turn on
★★★★★