An object of the present invention is to provide a technology for preventing wrinkles on metal foils such as nickel, tin, cobalt, chromium and iron from being generated in order to facilitate their handling. According to further aspects the invention relates to compositions comprising the compounds and the use of the compounds in the synthesis of disaccharides and medicine. The display sign is adhered to said base material. The tool includes a magnetic coil energizable to urge the closure element in a direction to cause the retention element to move from its open to its closed state. After the user identifies the shelves having flashing alpha-numeric displays, the user may enter a dispense mode or may logoff causing the unlocked doors to lock.