services, consulting, research, studies, development, publishing, installation, import, export, production and marketing of products in the fields of telecommunications, security, computer science and electrical engineering, as well as in the construction industry, in particular through the operation of a study office; maintenance of technical installations of buildings and industrial sites, engineering services, studies and design in the technical and industrial field as well as projects in the electrical field, ensuring the monitoring and management of works; construction, renovation, layout, equipment, surveillance and cleaning of buildings; general or total contracting work (cf. statutes for complete purpose).