Production of navigation devices, measuring instruments and control instruments
Manufacture of neon lights, neon signs, indicator signs of light, etc.
Manufacture of other electrical appliances for acoustic or visual signs: ringings, sirens, indicating boards, monitrons for protection against theft and fire
Installation of secondary power supply systems (electrical generators)
General coordination on the construction site
Building of tunnels for roads and railways and other underpasses
Setting of electric cables and appliances
Setting of telecommunication systems and computer installations
Setting of electrical installations of heating
Setting of antennas and lightning rods
Retail trade of radio and television appliances and other audio-video appliances for domestic use, such as video recorder, cameras, hi-fi equipment, etc.