Industrial plant maintenance; Maintenance of electronic measuring devices; Maintenance, installation and repair of electrical items and equipment; Maintenance, installation and repair of industrial apparatus and instruments; Advisory services for maintenance; Advisory services relating to the maintenance of buildings; Building maintenance; Computer support services (advisory and information services in relation to the repair, maintenance and installation of computer hardware and peripherals); Computer support services (installation, repair and maintenance of computer hardware and peripherals); Diagnostic maintenance services; Machinery installation, maintenance and repair; Machinery maintenance services; Maintenance and repair of buildings; Maintenance and repair of communications systems; Maintenance and repair of electrical apparatus; Maintenance and repair of electronic apparatus; Maintenance and repair of electronic installations; Maintenance and repair of industrial apparatus; Maintenance and repair of instruments; Maintenance and repair of utilities in buildings; Maintenance of electronic monitoring devices; Maintenance of electronic testing devices; Maintenance services for industrial plants; Repair, maintenance and installation advisory services; Repair, maintenance and installation consultancy services