Manufacture of electric appliances for signs, controls or commands for roads, railways, waterways, port installations, and for airports
Installation of secondary power supply systems (electrical generators)
Setting of monitoring systems and alarms against housebreakings
Installation in buildings or in other projects of building of: heating systems by electricity, gas and fuel, boilers, materials and pipes for ventilation and air conditioning, etc.
Installation in buildings or in other projects of building of: heating, cooling and ventilation systems (except heating)
Repair of consumer electronics
Installation of heating, air-conditioning and ventilation
Wholesale in electronic materials, inclusive of material for installation
Electro-technical installation works at buildings
Wholesale in installation materials used by plumbers and for the installation of heating