19 BUILDING MATERIALS, namely, SLABS OF SOLID SURFACING MATERIAL MADE PRIMARILY OF SLABS, PLASTER BOARDS, FLOORING TILES AND PLASTIC FOR USE IN INTERIOR BUILDING CONSTRUCTION; BUILDING MATERIALS, SOLID SURFACING MATERIAL IN THE FORM OF SLAB OR SHEET STOCK, AND SHOWER AND TUB ENCLOSURES; NONSTRUCTURAL BUILDING MATERIALS, namely, WINDOW SILLS, THRESHOLDS, AND WAINSCOT; BUILDING MATERIALS, SOLID SURFACING MATERIAL IN THE FORM OF SLAB OR PLASTER BOARD; FLOORING TILES; DOOR CASINGS, NOT OF METAL; STONE, CONCRETE AND MARBLE FIGURES; NON-METAL FLOOR TILES; FLOORING UNDERLAYMENTS; NON-METAL GATES; GRANITE; MARBLE; FLOOR PANELS; WALL PANELS NOT OF METAL; PAVERS; PLANKS; PLASTER; CEMENT, MARBLE AND STONE STRUCTURES; CEMENT, CONCRETE, CLAY AND SLATE SLABS; STUCCO TILES; PAVING TILES; WALL TILES; VENEER FOR FLOORS; NON-METAL WAINSCOTTING; WALL BOARDS; NON-METAL WINDOW FRAMES; SOLID SURFACING MATERIAL USED AS A WOOD SUBSTITUTE