37 Installation and maintenance of electric and electronic apparatus, devices and instruments for the remote control of building technology and industrial installations and of industrial operations; installation of scientific apparatus and instruments related to the field of physics and parts therefor, namely, devices for monitoring temperature, apparatus for the input and output of digital or analog physical quantities, in the nature of thermo-hygrometers, flowmeters, gas meters, water level indicators, thermometers, manometers, electric regulating devices, namely, field regulators, apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electric current, apparatus for recording, transmission or reproduction of sound or images, data processing apparatus and computer apparatus, namely, computer peripheral apparatus, electronic and electric apparatus, devices and instruments for the remote control of building technology and industrial installations and of industrial operations, electric disturbance signal units, namely, signal mirrors, signal bells, mobile radio units, electric readers being data processing equipment, alarm sensors, acoustic sound alarms, electric display units in the nature of luminescent display panels, phototelegraphy apparatus, computer memory devices, electronic notice boards, audio and video receivers, electrodynamic apparatus for the remote control of signals, computer-controlled apparatus for measuring frequency, high-frequency apparatus, namely, high frequency communication transmitters, receivers and antennas, interfaces for computers, data processing equipment in the nature of optical, memory card and smart card readers, microprocessors, monitors being computer hardware, electric relays, scanners being data processing equipment, electric apparatus for communication, transmitters of electronic signals, electric monitoring apparatus, namely, temperature monitors