This patent covers the two holes in the front knuckle which can be used to attach the pulley cage of the Huret Challenger, Huret Success, Huret Super Success and Huret Eco.

• Publisher: US Patent and Trademark Office
• Inventor: Roger Huret
• Country: USA
• Date: Priority date February 1978
• Derailleur brands: Huret
• Derailleurs: Huret Challenger, Huret Success, Huret Super Success and Huret Eco