Signal for lunch at the factory:
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Forklift raises, lowers forks
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Circular knitting machine
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Power station turbine
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Car factory, hammer knocking, welding
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Letter press
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Heidelberian sorting printer
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Glass bottles on a conveyor line, room noise
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Canning machine
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Grind metal on a grinding machine in a
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General noise, Work in a warehouse, loaders
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Laser welding
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Stitching machine
★★★★★