Notches, print imprinted in cardboard:
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Grind metal on a grinding machine in a
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Power station generator
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Gas welding
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General noise, Work in a warehouse, loaders
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General noise, Factory work
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Steam pump
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Forklift in motion
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Off, standby, on, Forklift
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Low frequency running engine
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Stitching machine
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Machine engine gaining momentum
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Industrial exhaust fan
★★★★★