 STET was founded by IRI on October 21 of 1933 as the ""STET - Società Torinese per l'Esercizio Telefonico"" and was based in Turin with headquarters in Rome.The aim of the company was to address technical, administrative and accounting of all state's company for telephone services and for public telecommunications services in Italy.In 1964 fostered the born of the research center CSELT to modernize the Italian phone service, and in 1976 the campus of Scuola Superiore Guglielmo Reiss Romoli was built in L'Aquila to support training activities for managers and executives of the group.