19 construction materials and modular structural components for exhibition, presentation and fair booths made of wood, composition board, fiber board and/or plastics, namely rails, railings, posts, struts, beams, rods, ceiling plates, doors, end caps, finials, and decorative panels; pocket structures and connectors, namely screws, connecting links and nuts for the connection of wood, composition board, fiber board and/or plastics, sold as a unit with the aforementioned rails, railings, posts, beams, rods, ceiling plates, doors, end caps, finials and decorative panels, and replacement parts therefor