The Industrial Society of Loth Processes (SIPL) was founded in Paris in 1921. Its activity then focused on radio guidance and the field of civil and military telecommunications.
In 1952, with the arrival of Philips in its capital, SIPL became TRT : Radioelectric and Telephone Telecommunications.
In 1967, following a call for tenders from the city of Grenoble, which was organizing the Winter Olympics the following year, TRT developed a universal modular electronic regulator (REMU) which was its first intersection controller. More than 80 cities will be equipped with it.
A specific controller for the city of Paris market was also created in 1970. The last one was filed in 1998.
In 1978, the road traffic activity of TRT was sold to Omera.