Norbert Jansen

Dr. Arnold Schäfer GmbH is a German company that provides real estate services. The company is based in Saarlouis, Germany and has subsidiaries in Germany. Heiko Sonnekalb has been the CEO of the private company since 2007.

Herweck AG is a German technology company that offers a wide range of services and products such as mobile communications, IT connectivity, headsets, and conference phones. The private company is based in St. Ingbert-Rohrbach, Germany and was founded in 1985 by Dieter Philippi and Jörg Herweck. The company also provides measuring devices, cloud telephony, and technology support.

Part of Dr. Arnold Schäfer GmbH, Lakal GmbH is a European specialist in roller shutter and door technology, sun and insect protection. Lakal is based in Saarlouis, DE. The company combines German efficiency with French creativity. The CEOs of the company are Heiko Sonnekalb, Yannick Gross.

Part of Stadt Völklingen, Stadtwerke Völklingen Vertrieb GmbH is a German company that supplies gas, electricity, heat, and water. The company is based in Voelklingen, Germany. The CEOs are Julian Wollscheidt and Marc André. The company was founded in 2003.