prov:value
| - ium, tungsten, aluminum, bismuth, nickel, molybdenum, iron, copper, boron, cobalt, beryllium, zinc, and tin; metal alloys such as steel, brass, bronze, boron carbide whiskers, and tungsten carbide whiskers; metal oxides such as zinc oxide, iron oxide, aluminum oxide, titanium oxide, tin oxide, magnesium oxide, and zirconium oxide; particulate carbonaceous materials such as graphite, carbon black,
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