And finally... this is Jean Ras' third design for a leaf spring actuated derailleur. We get some lightening holes in the main arm and the addition of guide rails around the pulley.

This is the version that so impressed Daniel Rebour, writing in Le Cycle in October 1946.

• Publisher: L’Institut national de la propriété industrielle
• Inventor: Jean Joseph Marius Pierre Ras
• Country: France
• Date: Priority date January 1946
• Derailleur brands: RAS
• Derailleurs: RAS Course