1978
ELEF is founded

1979
First tunnel maintenance and engineering works

1980
First airport switchboards and facilities

1981–1989
First post and telecommunications works and first facilities in hospitals

1990–1995
Radio bridges, electrical systems and safety systems

1996
Infrastructures and large buildings First photovoltaic lighting

1999
Major tunnel infrastructure engineering projects

2000–2010
ELEF establishes itself as an undisputed leader in the design and installation of systems and facilities for roads and tunnels

2010–2014
First systems developed for the detection and management of complex data and events (smart buildings, systems integration)

2015
Entry into new markets (Dubai and Abu Dhabi)

2016
First contract in Serbia acquired under projects for the construction of European Corridor 10