Diatto-Clément, Diatto A Clément, was an Franco Italian manufacturer of motor vehicles between 1905 and 1909. Adolphe Clément-Bayard created the 'Diatto-Clément Societa Anonima' in partnership with Diatto who had been coachbuilders in Turin since 1835. In 1909 Clément-Bayard left the business and the company was renamed 'Societa Fonderie Officine Frejus'. Giovanni Gagliardi drove a Diatto Clément 10/12 hp to class victory in the Milano-Sanremo race on 4-5 April 1906. Entered in the class for 'Cars costing L. 4000 to L. 8000' it covered the 317 km in 9 hours 17 minutes 3 seconds.