Non-metallic building materials, namely, paving blocks, bricks, posts, slabs, concrete panels, tiles; cement; cement based mixtures for use in maintenance of buildings and in civil engineering constructions; non-metal concrete posts; cementatious products and building materials, namely, Portland cement, filling cement, cement aggregates, and magnesium oxide-based cement; ready to use cement for building purposes; cement and cement aggregates for use in civil engineering, construction and buil...