19 Building and construction materials and elements, not of metal, namely, non-metal roof trusses, non-metal roof coverings, pergolas not primarily of metal, non-metal shelter structures other than tents, nonmetallic transportable constructions, glass for building, glass panels for building construction purposes, safety glass for building purposes, plate glass windows for building, shutters made of nonmetallic materials, porches, not of metal, for building, roofing systems for sun and weather protection comprising glass panels, metal frames and columns, and shading elements; doors, gates, windows and window coverings, not of metal; shelter structures and transportable buildings, not of metal; shutters in the nature of outdoor blinds, not metal and not of textile; jalousies, not of metal; glass walls, namely, glass roof panes; Indoor jalousies not of metal; parts and accessories for all the aforesaid goods, included in this class, namely, non-metal exterior window shades, non-metal glass terrace fittings