This advert is possibly the earliest mention of the single cable Cyclo Course (later called the Cyclo Sport) and Cyclo Route derailleurs.

(Source gallica.bnf.fr/ Bibliothèque nationale de France)

• Publisher: L'Officiel A.C.M.
• Country: France
• Date: June 1950
• Derailleur brands: Cyclo
• Derailleurs: Cyclo Sport, Cyclo Route