Jürgen Bernhard Röcker

Vereinigte Kreidewerke Dammann GmbH & Co. KG engages in the production and sale of fine chalk, coarse chalk, and fertilizer limes. It offers rubber and ceramic products, paints and lacquers, industrial fillers, straight feedstuffs, trace elements, binders and anti-caking agents, garden limes, molds and substrates, as well medicinal and sports chalk. The company was founded by Heinrich Dammann in May 1955 and is headquartered in Cologne, Germany.

Omya GmbH engages in the sale and distribution of industrial minerals based on calcium carbonate and dolomite, as well as chemical products. Its solutions include paints, coatings, inks, adhesives, sealants, plasters, joint fillers, glass and ceramics, cement based products, film, sheet, fibers, pipes and profiles, rubber and elastomers, thermosets, as well as cable, flooring, and coated fabrics. The company was founded in 1927 and is headquartered in Cologne, Germany.

Kreidewerk Rügen GmbH engages in the extraction, processing, and distribution of chalk, chalk products, and other building materials. The company was founded on March 20, 1991 and is headquartered in Sassnitz, Germany.