[Class : 6] Ventilating Ducts Of Metal, Storage Installations [Structures] Made Of Metal, Storage Bins Of Metal, Stair Treads Of Metal, Stair Nosings Of Metal, Refractory Furnace Linings Of Metal, Refractory Blocks Of Metal For Use As Furnace Linings, Reels Of Metal, Non Mechanical, For Air Hoses, Pipes Of Metal, For Central Heating Installations, Metal Heating Ducts, Metal Ducts For Ventilating And Air Conditioning Installations, Metal Door Frames For Refrigerating Rooms, Heating Ducts Of Metal, Furnace Fireguards Of Metal, Fired Refractory Materials Of Metal [Building Materials], Ducts Of Metal For Ventilating And Air Conditioning Installations, Ducts Of Metal For Ventilating Installations, Ducts And Pipes Of Metal For Central Heating Installations, Door Frames Of Metal For Refrigerating Rooms