| http://www.w3.org/ns/prov#value | - The glass fibers of claim 7 in which the glass composition contains the following constituents, in weight percentages:Ro; 0 - 0.5% al2 O3; 0 - 0.5% Mx Oy ; 0 - 0.5%wherein R is an alkaline earth metal, M is a metal other than the above metal components, and x and Y are positive integers and the valence of M multiplied by x equals 2y. 9.
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