Equipment for commercial kitchens – Mobile equipment – Part 3: Tray service trolley, non heated
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 01/01/1997

Equipment for commercial kitchens – Mobile equipment – Part 3: Tray service and food container trolley, requirements and testing
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/2011