19 Building and construction materials and elements, not of metal, namely, wall panels, and window and door frames made of wood and plastic; non-metal doors, gates, windows and window coverings, namely, non-metal shutters and claddings; structures, namely, transportable buildings, not of metal; prefabricated and transportable buildings, not of metal, and non-metal structural parts therefor, namely, balcony glazing in the nature of glass door lites, non-metal partitions for building, verandas and conservatories or other extensions comprised of non-metal railings, folding systems comprised of non-metal folding doors, sliding systems comprised of non-metal runners for sliding doors, facades in the nature of building panels not of metal, panel elements in the nature of building panels not of metal, sliding wall panels, parallel sliding and tilting doors, projecting balconies comprised of non-metal railings for balconies with and without incorporated folding window systems, balcony roofing, entrances for shops, houses and flats, and for conservatories comprised of non-metal door frames; wood rafters, connections for eaves in the nature of non-metal eave connectors for balconies, shop, house and apartment entrances, for conservatories or other extensions of buildings, construction elements not made of metal in the nature of corner supports, wall connections in the nature of panels, all of the aforesaid goods not of metal; parts and accessories for all the aforesaid goods, included in this class, namely, wall panels not of metal