installation of electronic communications networks; installation and maintenance of electronic apparatus; installing of electronic communications networks; installation of electronic and digital connections to call centres; installation, maintenance and repair of electrical and electronic apparatus and equipment; installation of electrical appliances; installation of interactive signs and graphics; installation of digital locks; repair and maintenance of electronic installations; electric appliance installation; maintenance and repair of electronic installations; installation of visual signs, electrical signs, non-electrical signs, electronic signs and digital signs; electrical installation services; installation of electronic and digital connections to call centers; installation of computerised information systems; computer installation; provision of construction information by electronic means; installation of signages; repair of electronic business equipment; installation of lighting systems; installation of computerized information systems; lighting system installation; installation of computers; installation of electric light and power systems; installation, maintenance and repair of electronic, electrical and mechanical apparatus; installation of audiovisual equipment; installation services; installation, maintenance and repair of electronic data processing apparatus; installation, maintenance and repair of electrical and electronic measuring and testing apparatus and instruments; office equipment installation; repair and maintenance of electronic display panels; installation of wireless telephony equipment; maintenance and repair of electronic display panels; installation, maintenance and repair of electronic regulating apparatus; installation of working and building platforms; installation of building automation equipment; digital lock installation; installation of communication equipment; installation of electric and electronic equipment in automobiles