Unfortunately there is no image on this registered design - but I believe that it relates to the Simplex Prestige (532). The description specifies that it relates to a derailleur made of plastic and metal.

• Publisher: L’Institut national de la propriété industrielle
• Inventor: Lucien Charles Hippolyte Juy
• Country: France
• Date: French application July 1962
• Derailleur brands: Simplex
• Derailleurs: possibly relates to the Simplex Prestige (532)?