19 Flange beams and cross-beams, not of metal; door cases and frames, not of metal; wood planking; battens, namely, wood trim, wood paneling, non-metal roof coverings; columns, not of metal, namely, pre-fabricated nonmetal architectural columns, pressure-treated wood columns, non-metallic advertisement columns; window frames, not of metal; ceiling panels not of metal; wall panels not of metal, floor panels not of metal, nonmetal window frames; door frames, not of metal; window frames, not of metal; bulkheads, namely, staircases, stair treads not of metal not of metal; reinforcing materials, not of metal, for building; asbestos mortar; asbestos cement; beams, not of metal; balustrading; concrete; concrete building elements, namely, blocks, bricks, posts, slabs, panels; bituminous products for building, namely, bituminous roof coatings, bitumen-based sealants for asphalt, bitumen-based sealants for driveways; flashing, not of metal, for building; plaster; earth, namely, sand, building stone for bricks; fire-clay, namely, clay ash, clay roofing tiles; slabs of clay; doors, not of metal; folding doors, not of metal; lintels, not of metal; door panels, not of metal; wood panelling; wainscotting, not of metal; furrings of wood, namely, wood trim, wood posts, wood beams; veneers of wood; paperboard, namely, wall boards, plywood board, sheathing board for building; gutters, not of metal; building stone; slag stone; cornices, not of metal; bricks; binding agents for making briquettes, namely, adhesive mortar for building purposes, sealer coatings sold as an integral component of non-metal tiles, natural stone, and molded resins for construction purposes; buildings, not of metal; parts of non-metal staircases, namely, stringers, not of metal; bituminous coatings for roofing; roof coverings, not of metal; roofing slates; roofing, not of metal; non-metal hips for roofing; building timber, not of metal; timber; building timber; staircases, not of metal; wall claddings, not of metal, for building; laths, not of metal; floor boards; wall linings, not of metal, for building, namely, non-metal curtain walls, wall tiles; casement windows, not of metal; wainscotting, not of metal; parquet flooring; parquet floor boards; partitions, not of metal, namely, non-metal wall-mounted panel units for exhibitions, displays and partitioning, Japanese style indoor sliding partitions; floors, not of metal; lintels, not of metal; sand, except foundry sand; sandstone for building; sawn timber; tiles, not of metal, for building; window sills, not of metal; building stone; refractory concrete; slag-lime cement; clinker stones; Portland blast furnace slag; veneers, namely, veneer wood, wood veneers