| http://www.w3.org/ns/prov#value | - n, manganese, lead, zinc, tungsten, silver, titanium, and nickel; metal alloys such as brass, steel, and bronze; metal sludge; metal oxides such as aluminum oxide, titanium dioxide, magnesium oxide, ferric oxide, beryllium oxide, magnesium oxide, molybdenum trioxide, chromium oxide, titanium oxide, and zinc oxide; metal nitrides such as boron nitride, silicon nitride, and aluminum nitride, metal c
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