The ‘Objet’ line might translate as something roughly like: ‘Apparatus type “Route Léger with single piece bracket” with long tension arm and spring’.

• Publisher: L’Institut national de la propriété industrielle
• Inventor: Lucien Juy
• Country: France
• Date: French application August 1941
• Derailleur brands: Simplex
• Derailleurs: Simplex Route Léger