19 CONSTRUCTION MATERIALS NOT OF METAL, NAMELY - TOUGHENED AND SEMI-TOUGHENED WINDOW GLASS AND DOUBLE-GLAZING, LAMINATED WINDOW GLASS AND DOUBLE-GLAZING, WINDOW GLASS AND DOUBLE GLAZING FOR THERMAL INSULATION AND REINFORCED THERMAL INSULATION, WINDOW GLASS AND DOUBLE-GLAZING FOR SOUND-PROOFING, WINDOW GLASS AND DOUBLE-GLAZING FOR PROTECTION, WINDOW GLASS AND DOUBLE-GLAZING FOR RENOVATION, WINDOW GLASS AND DOUBLE-GLAZING FOR SUN-CONTROL, CONVEX GLASS PANELS, CLEAR OR TINTED GLASS PANELS, WIRED GLASS PANELS, GLASS BLOCKS, GLASS WALL COVERINGS, PARTITIONS MADE OF GLASS, STRETCHED GLASS, BLOWN GLASS, TOUGHENED AND NON-TOUGHENED GLASS DOORS, PRIMARILY NON-METAL DOORS WITH BUILT IN GLASS, FIRE-PROOF WINDOW GLASS, FLAME PROOF WINDOW GLASS, ATTACHED EXTERIOR GLAZINGS AND GLUED EXTERIOR GLAZINGS FOR USE ON FACADES OF BUILDINGS, SLIDING CURVED WINDOWS, WINDOW GLASS WITH OPERATED OPACITY, PROTECTIVE WINDOWS GLASS AGAINST X-RAYS