Movable Partition Walls, Interchangeable Partition Walls, Rigid Partition Walls, Components of Partition Walls, i.e., Vertical Posts, Horizontal Cross-Bars, Brutt-Straps, Fastening and Adjusting Screw Jacks, Connecting and Fastening Implements, Impermeability Junction Flanges, Jointings, Plinths, Angle Mouldings, Sleepers, Casing Items, Casing Boards, Intermediate Ceilings, Metallic Frames, Curtain-Walls, Prefabricated Constructions, All These Objects in Metal