| http://www.w3.org/ns/prov#value | - Specific examples of metallic materials may be selected, for example, from metals such as gold, iron, niobium, platinum, palladium, iridium, osmium, rhodium, titanium, tantalum, tungsten, ruthenium, zinc, and magnesium, among others, and alloys such as those comprising iron and chromium (e.g., stainless steels, including platinum-enriched radiopaque stainless steel), niobium alloys, titanium alloy
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