This is one of two designs, registered to Eugène Barry, that combine a derailling fork and chain tensioning arm in one unit. Eugène branded his contraption Le Super-Simple. The other registered design is French Registered Design # 26617-001.

• Publisher: L’Institut national de la propriété industrielle
• Inventor: E. Barry
• Country: France
• Date: French application March 1936
• Derailleur brands: Le Super-Simple
• Derailleurs: Le Super-Simple (2nd style)