This patent describes the Ofmega Mistral in all its plastic beauty. The derailleur is pictured as not having an adjustable outer cable stop, perhaps indicating that this was its original incarnation.

• Publisher: L’Institut national de la propriété industrielle
• Inventor: Dino Perotti & Mario Perotti
• Country: France
• Date: Italian application October 1981, French application October 1982
• Derailleur brands: Ofmega
• Derailleurs: Ofmega Mistral