CPV: 50000000 Repair and maintenance services, 50232110 Commissioning of public lighting installations, 50232200 Traffic-signal maintenance services, 50310000 Maintenance and repair of office machinery, 50331000 Repair and maintenance services of telecommunications lines, 50332000 Telecommunications-infrastructure maintenance services, 50333100 Repair and maintenance services of radio transmitters, 50333200 Repair and maintenance services of radiotelephony apparatus, 50334200 Repair and maintenance services of line telegraphy equipment, 50334400 Communications system maintenance services, 50342000 Repair and maintenance services of audio equipment, 50343000 Repair and maintenance services of video equipment, 50512000 Repair and maintenance services of valves, 50513000 Repair and maintenance services of taps, 50711000 Repair and maintenance services of electrical building installations, 50712000 Repair and maintenance services of mechanical building installations, 50721000 Commissioning of heating installations, 50730000 Repair and maintenance services of cooler groups, 51111100 Installation services of electric motors, 51111200 Installation services of generators, 51111300 Installation services of transformers, 51112100 Installation services of electricity distribution equipment, 51112200 Installation services of electricity control equipment, 51133100 Installation services of gas turbines, 51212000 Installation services of time register equipment, 51311000 Installation services of radio equipment, 51313000 Installation services of sound equipment, 51314000 Installation services of video equipment, 51330000 Installation services of radiotelephony apparatus, 51611100 Hardware installation services, 51612000 Installation services of information-processing equipment, 51620000 Installation services of office equipment, 51700000 Installation services of fire protection equipment, 51900000 Installation services of guidance and control systems