19 PLASTIC CONSTRUCTION ELEMENTS FOR SPACE FRAMEWORKS; NAMELY, STRUCTURAL PANELS MADE OF PLASTIC ALONE OR IN COMBINATION WITH OTHER MATERIALS; PREFABRICATED PLASTIC WALLS, FLOORS AND CEILING, WINDOW, DOORS AND FACING PANELS FOR BUILDINGS; ROOF FRAME WALLS FOR BUILDINGS INCLUDING DOMES; FRAMEWORK FOR CEILINGS AND WALLS; PRE-FABRICATED SHEDS, AEROPLANE HANGERS, GREENHOUSES, PYLONS, SCAFFOLDING; CONSTRUCTION ELEMENTS FOR SPACE FRAMEWORKS; NAMELY, STRUCTURAL PANELS MADE OF WOOD OR MINERAL BUILDING ELEMENTS SUCH AS CONCRETE ALONE OR IN COMBINATION WITH OTHER MATERIALS; PREFABRICATED APARTMENTS; PREFABRICATED BUILDINGS FOR SPORTS, RECREATIONAL FACILITIES, TRADE PURPOSES AND FOOD SUPPLIES; PREFABRICATED WALLS, FLOORS AND CEILINGS; WINDOWS, DOORS AND FACING PANELS FOR BUILDINGS