| http://www.w3.org/ns/prov#value | - The fibers 16 which can be used in the present invention can be carbon or graphite fibers, or fibers made from mineral or ceramic materials such as alumina/silica/boria, silicon carbide or zirconia fibers, or metal fibers such as stainless steel, or steel which has been sufficiently protected from oxidation by coating of gold, silver or other precious metal alloy.
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