From the website:
Trendelkamp – Innovative Mechanical Engineering since 1897. Our competencies are in Plastic Machinery and Extrusion, Auditorium Systems and Building Technologies, and in the development of custom machines or structures. Our Procucts: Screen Changer, Diverter Valves, Pellet Classifiers, Extruder Degassing Unit; Chair Track Systems, Retractable Roof Systems, Building Maintenance Systems