37 Maintenance, repair and installation, in the field of the following goods: heating systems; maintainance, repair and installation, in relation to the following goods: apparatus and instruments for the conduction, distribution, conversion, storage, regulation and control of electric current; maintainance, repair and installation, in relation to the following goods: measurement apparatus and instruments, signalling apparatus and instruments and checking (supervision) apparatus and instruments; maintainance, repair and installation, in relation to the following goods: electric fittings for climate control and management; maintenance, repair and installation, in relation to the following goods: apparatus for heat control, boiler control instruments, valves, valve actuators, thermostats, air analysis apparatus, hygrometers, temperature indicators, detectors, electric installations for the remote control of industrial operations; maintenance, repair and installation, in relation to the following goods: process terminals for controlling, regulating and monitoring; installation, maintenance and repair of heating, cooling and ventilation apparatus; maintainance, repair and installation, in relation to the following goods: regulating and safety accessories for water or gas apparatus and pipes; maintenance, repair and installation services in relation to the following goods: thermostatic valves (parts for heating installations); maintenance, repair and installation, in relation to the following goods: electrical fixtures, electric apparatus and electric instruments, for use in the following fields: monitoring, control and regulation of mechanical and electronic equipment for heating, ventilation, lighting, fire systems and security systems; maintenance, repair and installation, in relation to the following goods: control installations and regulating systems, for use in relation to the following goods: mechanical and electronic equipment for heating, ventilation, lighting, fire systems and security systems; installation, maintenance and repair of computer hardware.