This shows a Huret Luxe with another crazy hinged pulley cage design which may be a forerunner of the Duopar design.

• Publisher: US Patent and Trademark Office
• Inventor: Jacques and Roger Huret
• Country: USA
• Date: US application filed February 1971, French application filed October 1970
• Derailleur brands: Huret
• Derailleurs: Huret parallelogram designs