37 Installation, maintenance, and/or repair in the field of communications technology, telecommunications networks and/or equipment; repair, installation and maintenance of water consumption measurement equipment and systems and of room control equipment and systems, namely water meters, heat meters, electricity meters, gas meters, energy cost allocators, wireless data transmission modules, radio transmitters and radio receivers for reading of electricity, heat, water and gas meters, remote optical readers connected to the energy meters, devices for displaying energy consumption, data busses, receivers reading of electricity, heat, water and gas meters, data busses and systems for the control of temperature of temperature, humidity, lighting systems, and blinds, comprised of regulators, computer control stations, temperature sensors, radio transmitters and receivers, computer control stations, temperature sensors, radio transmitters and receivers; communication devices