Breakdown press:
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Low frequency running engine
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Milling machine
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Industrial exhaust fan
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Grind metal on a grinding machine in a
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Newspaper press
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The atmosphere of the factory, rattling
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Postal sorting line
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Welding, Car factory, hammer knocking
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Shutdown, Compressor, start, run
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Hydraulic down machine
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Electric generator (hum)
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Welding transformer operation under load
★★★★★