Compressor, start, run, shutdown:
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Factory atmosphere, drone in a mine tunnel
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Steam pump
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Grind metal on a grinding machine in a
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Power station generator
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Rattling, The atmosphere of the factory
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Letter press
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Automatic telephone switch
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Car factory, welding, hammer knocking
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Power station turbine
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Gas welding
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Milling machine
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Air blow, Air compressor
★★★★★