37 Building construction services; services in the field of airport construction, namely, the construction of hangars, towers, halls and maintenance frameworks for planes; building of fair stalls and shops; building construction supervision; scaffolding construction; construction of buildings, namely, construction of transportable buildings using pipes, tubular bars, bars, profile rods, stays, mounts, building boards and board-shaped components, wainscoting, and prefabricated components in the form of wall, window, door, floor, ceiling, facade or lining elements; construction of buildings with built-in installations, and connecting and supporting elements; construction of buildings made of flat and curved bar elements, joint elements, area elements, such buildings including components such as roofs, domes, ceilings, building walls, facades, halls; construction of layout frameworks, namely, buildings including airplane hangars, greenhouses, towers, drilling rigs, cooling towers for industrial installations, towers for chemical installations; construction of layout frameworks, namely, construction of three-dimensional frameworks, namely, construction of pedestrian and vehicular bridges; construction of layout frameworks, namely, construction of advertising structures including advertising towers and billboards; construction of maintenance frameworks for air, land and water vehicles, and of maintenance frameworks for large stationary and mobile machines; maintenance of buildings, namely, maintenance of roofs, roof structures, and building frameworks