the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces, e.g. in vertical arrangement

Full Title

Feed-water heaters, i.e. economisers or like preheaters > with water tubes arranged in the boiler furnaces, fire tubes or flue ways > the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces, e.g. in vertical arrangement

Child Classifications

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• F22D 1/10 in horizontal arrangement