Stephan von der Heyde

HUMMEL Systemhaus GmbH & Co. KG engages in the development, production, distribution, installation, and maintenance of building technologies as well as information technology, communications, energy, and security systems. It offers services, which include installation of electrical systems for private households and commercial buildings and multimedia equipment, IT business consulting, installation of communication networks and conference technologies, optimization of energy use, and installation of security and fire alarm systems. The company was founded by Frank Hummel in 1993 and is headquartered in Frickenhausen, Germany.

Ed. Züblin AG engages in the provision of building construction and civil engineering services. Its services include turnkey construction, structural maintenance, tunnelling, ground engineering, structural steelwork, timber construction, environmental technology, bridge construction, chimney and refractory engineering, construction logistics, and modular construction . The company was founded by Eduard Züblin in 1898 and is headquartered in Stuttgart, Germany.