6 Semi-Finished Products Made of Ferrous and Ferrous Alloys in the Form of Blocks, Panels, Sheet, Strip, Thin Sheet, Bar, Tube and Other Sections, Also in Combination with Other Materials, Especially Plastic Materials; Composite Products Made, at Least in Part, of Ferrous or Ferrous Alloys-Namely, Structural Panels, Sandwich Plaques, Roofing Panels and Panels for Covering the Interiors and Exteriors of Buildings, Partition Panels, Balcony-Railing Panels; Cover-Panels for Equipment; Containers for Solids or Liquids, License Plates, Warning and Indicating Panels Provided with an Inscription for Signaling or Conveying a Message