Electric welding:
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Run, Compressor, start, shutdown
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Work in a warehouse, general noise, loaders
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Book press
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Hydraulic machine up
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Newspaper press
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Welding transformer operation under load
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Compressor industry
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Hammer knocking, Car factory, welding
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Air blow, Air compressor
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Air compressor turn on, turn off
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Spectrograph
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Forklift drives by
★★★★★