Following the death of Lucien Juy in 1976, these designs are not registered in his name but in that of Etablissements Le Simplex S.A.R.L.. The address in Dijon has also changed.

• Publisher: L’Institut national de la propriété industrielle
• Inventor: Etablissements Le Simplex S.A.R.L.
• Country: France
• Date: French application June 1977
• Derailleur brands: Simplex
• Derailleurs: Simplex Prestige LJ (LJ1000 CP)