| http://www.w3.org/ns/prov#value | - The transparent quality of a refractory product of this invention is coincident with other desirable properties, such as strength and flexibility, and thus transparency can be considered in a sense as a gross measure of the quality of the refractory product. yIn some applications of the refractory products of this invention, e.g. where a fiber or bundle of fibers are used in fiber optics or where
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