Rainer Grohe

Wasserkraft Volk AG is a technology leader in the field of hydroelectric power plants up to 35 MW. The private company is based in Gutach, Germany. The German company specializes in the production of turbines, control systems, and services that are customized, durable, and environmentally friendly. The company was founded in 1979. The CEO is Franziskus Rettenbacher.

Graphit Kropfmühl GmbH engages in the production and marketing of metallurgical silicon and silicon dioxide. Its products include natural graphite; synthetic graphite; graphite parts; graphite dispersions; expandable and expanded graphite; and powder premixes. The company was founded in 1916 and is headquartered in Hauzenberg, Germany.

Part of ARD Holdings SA, Ardagh Metal Beverage Germany GmbH is a company that manufactures metal cans and plastic products for the beverage, food, personal care, and household products industries. The company is based in Bonn, Germany and was founded in 2000.

PFW Aerospace GmbH manufactures components for aircrafts. It provides tube, duct, cargo loading systems and structural and assembly components. The firm was founded in 1913 and is headquartered in Speyer, Germany.