Non-metallic building materials, namely, natural and synthetic stones; pre-fabricated parts and elements made of concrete and reinforced concrete for construction purposes, namely, concrete blocks in the nature of shaped concrete blocks for walls and supporting walls, concrete paving stones, concrete tiles, spacers made of concrete, wood, paper, synthetic materials or other organic materials to be placed between concrete tiles and stones of a paving layer, concrete palisade pales; concrete blocks in the nature of filter paving stones; tile-shaped paving units made of concrete paving stones connected to each other by predetermined break-off links; prefabricated concrete parts, namely, concrete blocks, concrete paving stones, concrete tiles and concrete bricks for making walls and enclosures capable of displaying plants; concrete stones as a ground cover and for walls; display walls, namely, heavyweight supporting walls comprising bricks and prefabricated elements made of concrete or reinforced concrete as well as wooden beams and joists used for building in conjunction with concrete blocks; non-metallic transportable houses, especially prefabricated garages made of concrete