| http://www.w3.org/ns/prov#value | - The method of claim 14, wherein the aggregate is a material selected from the group consisting of aluminum oxide, barium titnate, boron carbide, boron nitride, burundum, calcium carbonate, calcium phosphate, cerium oxide, chromium oxide, glass, iron oxide, lamp black, lime, magnesia, manganese dioxide, mullite, periclase, silicon carbide, tin oxide, titanium carbide, tungsten carbide, wheat starch
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