prov:value
| - The metal material is for example selected from iron, tungsten, chromium, manganese, molybdenum, nickel, palladium, platinum, titanium, vanadium, niobium, tantalum, copper, silver, gold, aluminum, bronze, brass, tin, tin alloys, lead, lead alloys, zinc, magnesium, Mg alloys, calcium, and mixtures and alloys of these metals, such as steel or high-grade steel.
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