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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Ferrous metallurgy involves processes and alloys based on iron.  It began far back in prehistory. The earliest surviving iron artifacts, from the 4th millennium BC in Egypt, were made from meteoritic iron-nickel. By the end of the 2nd millennium BC iron was being produced from iron ores from South of the Saharan Africa to China. The use of wrought iron (worked iron) was known by the 1st millennium BC." ] ,
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