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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Hot blast refers to the preheating of air blown into a blast furnace or other metallurgical process.  As first developed it worked by alternately storing heat from the furnace flue gas in a firebrick lined vessel with multiple chambers, then blowing combustion air through the hot chamber.  This is known as regenerative heating.  This has the result of considerably reducing the fuel consumed in the process." ] ,
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