Spectrograph:
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Jamming, Generator, work, start
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Conveyor belt, Conveyor
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Signal for lunch at the factory
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Standby, off, on, Forklift
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Compressor industry
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Gas welding
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Grind metal on a grinding machine in a
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Canning machine
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Mill for grinding grain, Brewing unit
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Steam pump
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Electric welding
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Room noise, Glass bottles on a conveyor line
★★★★★