The following information came from friend Frank Berto and page 166 of his wonderful book 'The Dancing Chain', second edition, The History and Development of the Derailleur Bicycle
This is a drawing by Daniel Rebour that came from page 7 of the November 27, 1948 issue of Le Cycle; coverage of the 1948 Milan Cycle Show. The exact text of the caption is:
"14. Le MECCAN CAMBIO est a commande rigide et comporte, comme LE CYCLO, une rampe helicoidal."
In his report of the show, Daniel said "Il y a les imatateurs qui ont substitue, sur on appareil a enroulement de chaine et tendeur, une commande rigide parallele au hauban a la classique transmission par cable (Meccan Cambio par example.)"
