| http://www.w3.org/ns/prov#value | - Examples of heavy weight fillers for use in the invention include titanium, tungsten, aluminum, bismuth, nickel, molybdenum, iron, steel, lead, copper, brass, boron, boron carbide whiskers, bronze, cobalt, beryllium, zinc, tin, metal oxides including zinc oxide, iron oxide, aluminum oxide, titanium oxide, magnesium oxide, zirconium oxide, and metal stearates including zinc stearate, calcium steara
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