37 Installation of electrical and electronic apparatus and instruments, namely, backplanes, printed circuit boards, processors, servers, computers, disc drivers, computer monitors; installation of monitoring and control instruments, namely, sensors, thermometers, thermostats, temperature pressure gauges for monitoring and controlling the temperature pressure, and speed, namely, of electrical fans; installation of electronic computer data processing racks, computer server racks, power supply systems, power supply cables, computer data lines, connection boards, connection boxes, connection strips, connection plugs, connection sockets, sockets, standby battery power supply equipment, electronic monitoring systems for rooms in the nature of room temperature, humidity and access controls, electronic control systems for computer centers; installation of cooling and air conditioning systems, namely, cooling systems for computer centers, control centers, measuring rooms and computer server rooms, cooling systems and cooling supply systems for electronic data processing rooms, electronic data processing racks, electronic data processing servers, computer server racks, as well as parts and subassemblies of the aforementioned goods; installation of air conditioning systems, ceiling-mounted cooling installations, humidifiers, electrical fans, plug-in fans, fan units, climate control and conditioning apparatus, heat exchangers, dryers, namely, dryers for the removal of water vapor from compressed air and gases; installation of ventilating equipment, namely, ventilating fans for commercial and industrial use; installation of water supply equipment and fittings for water supply systems and replacement parts of the aforementioned goods, namely, water tubes and valves