Frank Esser

Part of Salzgitter AG, Mannesmann Verwaltung GmbH is a German company that manufactures metal and stainless tubes. The company is based in Mulheim an der Ruhr, Germany.

Hüttenwerke Krupp Mannesmann GmbH is a steel manufacturing private company based in Duisburg-Huckingen, Germany. The CEOs of the German company are Herbert Eichelkraut, Gerhard Erdmann, Carsten Laakmann. The company specializes in the production of steel and precursors for the processing industry.

ATEGRIS GmbH provides diagnostic, therapeutic, and nursing health services in Mülheim and Oberhausen. The company is based in Mulheim an der Ruhr, Germany. The German company focuses on delivering high-quality care and offers various certificates and awards. ATEGRIS was founded in 2005 and is led by CEOs Martin Große-Kracht and Nils B. Krog.

Artur Naumann Stahl AG is a German steel trading company that specializes in the supply of sheet metal in over 30 different qualities. The private company is based in Neuss, Germany, and has sales offices in Stuttgart, Baot, and Krakau. The company offers processing, packaging, material testing, surface treatment, and logistics solutions. It has been in operation for 60 years and prides itself on being one of the few remaining group-free trading houses. It was founded in 1960 by Artur Naumann and is privately owned. The CEO is Jost Salzmann.