Factory atmosphere, drone in a mine tunnel:
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Working machine engine
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Notches, print imprinted in cardboard
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Work in a warehouse, general noise, loaders
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Electric generator (hum)
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Grind metal on a grinding machine in a
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Car factory
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Hydraulic down machine
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Power station turbine
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Air compressor turn on, turn off
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Printing press
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Breakdown press
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Letter press
★★★★★