Signal for lunch at the factory:
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Working,, turning on, Welding transformer
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Air compressor turn on, turn off
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Brewing unit, fluid drilling
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Dry cleaning
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Welding, hammer knocking, Car factory
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Work, Lathe turning on, stop
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Signal for lunch at the factory
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Steam pump
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Glass bottles on a conveyor line, room noise
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Factory atmosphere, drone in a mine tunnel
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Industrial exhaust fan
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Box making machine
★★★★★