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*Water-Containing Water Glass Fibers: United States Patent: 4,471,019, Sep. 11, 1984
*Manufacturing Silica Fibers. United States Patent, 4,332,601, Jun. 1, 1982. Arno Wegerhoff, Woerth and Karlheinz Hillermeier, Wuppertal. All of Fed. Rep. of Germany

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