History accurate Hi i found a source in german from 1872 stating the invention of glass fibers by Jules de Brunfaut French in 1849 and their use in textiles and filters Emanuel Herrmann Miniaturbilder aus dem Gebiete der Wirthschaft Nebert 1872 p 23 29 And another source by Saint Gobain describes the invention german patent 539738 of glass fiber non wovens by Friedrich Rosengarth German in 1930 which was subsequently bought by the author What to make of it Cheers