Steen Ejlskov Hansen

ROTO FRANK AG engages in the production and distribution of window and door technology. It offers fittings for side-hung, bottom-hung, and tilt and turn windows; for tilt and slide, fold and slide, and lift and slide door hardware; mechanical and electromechanical multi-point locking systems for main entrance doors; window-shutter hardware; as well as electronic accessories. The company was founded by Wilhelm O. Frank and Elfriede O. Frank in 1935 and is headquartered in Leinfelden-Echterdingen, Germany.

ACO Severin Ahlmann GmbH & Co. KG develops and markets drainage technology solutions. The offers drainage channels, backflow stop systems, oil and grease separators, pumps, and pressure-water-tight cellar windows. It specializes in industrial casting, continuous casting, special stainless steel construction, and process engineering business fields. The company was founded by Josef-Severin Ahlmann in 1946 and is headquartered in Buedelsdorf, Germany.