19 Buildings not of metal; building materials not of metal, stage constructions; roof coverings, not of metal; roofs, not of metal; roofing not of metal, incorporating solar cells; gutters not of metal; windows not of metal, window frames not of metal, floors not of metal; geotextiles; framework not of metal, for building, beams not of metal; pipes not of metal; movable buildings not of metal; partitions not of metal; staircases, not of metal; door frames, not of metal; linings not of metal, for building; primary structures (primary buildings) not of metal, included in this class