Johannes Zilkens

Kölner Bürgergesellschaft von 1893 AG engages in real estate business. It involves the management of capital and real estate assets, and the development of own and third-party properties. The company was founded by Karl Trimborn, Willi Braubach, Max Wirtz, H.C. Knetgens, and Rentner Heinrich Pilartz on April 13, 1893 and is headquartered in Cologne, Germany.

Rheintex Verwaltungs AG engages in the purchase, management, and sale of assets, shares, and properties. The company was founded in 1910 and is headquartered in Cologne, Germany.

Part of Altrad Investment Authority SAS, KIEL Industrial Services AG engages in petroleum refinery and energy generation activities. The company is based in Noerdlingen, Germany. The German company was founded in 2006. KIEL Industrial Services was acquired by Altrad Investment Authority SAS on July 08, 2021.

Kiel Montagebau GmbH & Co. KG provides process machinery maintenance services. The private company is based in Wesseling, Germany.