1879: Franz Swaty establishes a factory focused on mineral bonded abrasives.
1898: Joseph E. Weiler began manufacturing polishing brushes for the jewelry industry in Pforzheim, Germany.
1903: Franz Swaty’s hone receives a gold medal in Köln.
1944: Karl E. Weiler began manufacturing polishing brushes in a converted chicken coop in Franklin Square, Long Island, N.Y.
1953: Positioned as the sole producer of abrasives in Yugoslavia.
1957: Relocation of the company from Long Island to its current location in Cresco, Pennsylvania.
1958: Establishment of Comet as a manufacturer of magnesite-based artificial abrasives.
1970: Introduction of fire-resistant materials production intended for the foundry industry.
1971: Karl M. Weiler becomes president.
1979: Introduction of the 13131 industry standard "Stringer Bead" brush.
1979: Production start of reinforcement meshes for grinding wheels in Loče.
1981: Beginning of vitrified bonded grinding wheels production. Trial production of bakelite-bonded diamond grinding wheels.
Trial production of bakelite-bonded diamond grinding wheels.
1984: Beginning of glass fabrics weaving in Loče.
1987: Introduction of composite construction nylon abrasive "NYLOX" brushes.
1988: Weiler launches Tiger Abrasives and manufactures flap discs in Cresco; the first to manufacture coated abrasive flap discs in the U.S.
1992: Flap disc production begins.