1867 - The first hydraulic turbine is produced.
1923 - The shareholders of the Officine Calzoni in Bologna and Riva in Milan get together giving life to a stock company 1926 - The production of hydraulic turbines is moved to the plant in Milan 1946 - The Riva Finanziaria S.p.a holding is constituted. The Officine Calzoni in Bologna and Riva in Milan become controlled companies 1966 - Officine Calzoni in Bologna and Riva in Milan merged, creating the Riva Calzoni 1973 - The holding Riva Finanziaria S.p.a is rated at the Stock Exchange in Milan 1992 - 75% of the actions of the plant in Milan are sold to J.M. Voith Gmbh 2000 - Fusion of Riva Finanziaria S.p.a in Intek S.p.a, rated at the Stock Exchange in Milan, where the family Calzoni is a shareholder 2004 - Calzoni Hydro, begins its activity in the historical sector of the Calzoni or the realization of hydroelectric plants and more in the waters' management. It is controlled mainly by the Calzoni family.