42 [ engineering services, namely, project development, designing, technical drawing, drafting of expert reports, planning and technical consultation in the field of maintenance, insulating and cleaning of buildings, bridges, viaducts, tunnels, roads, railroads and other constructional work, demolition services, underwater dredging, scaffolding erection, laying of cables and pipelines, and installation of electrical wiring systems, sanitary systems, plumbing systems, central heating systems, ventilating systems, air conditioning systems, burglar alarm systems, insulation, glazing, kitchen and bathroom furniture and appliances; architectural services ]