19 Ceramic building materials, namely, ceramic flooring, ceramic tiles, ceramic drain pipes; bricks and refractory products, namely, fired bricks, clay roofing tiles, clay pipes and conduits, mortars; linoleum building materials, namely, linoleum wallboards, linoleum tiles, linoleum floorboards; plastic building materials, namely, plastic wallboards, plastic boundary marking posts, plastic tiles, plastic floorboards; synthetic building materials, namely, synthetic boards, soundproofing materials for floors, walls or ceilings, synthetic flooring materials or wall-claddings; asphalt, and asphalt building or construction materials, namely, asphalt, asphalt felt, asphalt roofing paper; rubber floor tiles; plaster for building purposes; lime building or construction materials; building or construction materials of plaster; prefabricated building kits not of metal; cement and its products, namely, alumina cement, Portland blast-furnace slag cement, concrete pipes, concrete piles, concrete road pavement boards, concrete blocks, silica cement, asbestos roofing tiles, asbestos cement boards, asbestos cement pipes, asbestos cement slates, asbestos cement chimneys, slag-lime cement, cement mortar roofing tiles, cement mortar pipes, cement mortar slates, hume pipes, Portland cement, magnesia cement, wood-fiber reinforced cement boards; glass for building; hen-houses and poultry cages not of metal; non-luminous, non-mechanical road signs not of metal