| http://www.w3.org/ns/prov#value | - Examples of the planar materials include glass, silicon oxide, ceramics, paper, metal plates or films such as aluminium, zinc, magnesium, copper, iron, chromium, nickel, silver, gold, platinum, palladium, alloys containing aluminium as a principal ingredient, alloys containing zinc as a principal ingredient, alloys containing magnesium as a principal ingredient, copper-zinc alloys, iron-nickel-chr
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