Lucien Juy, who died in 1976 is still named as the applicant. A hard working man.

• Publisher: L’Institut national de la propriété industrielle
• Inventor: Lucien Charles Hippolyte Juy
• Country: France
• Date: French application February 1973
• Derailleur brands: Simplex
• Derailleurs: Simplex Prestige Super LJ (615)