This patent is not for a derailleur - but for a mere chain tensioner. It does, however, identify Max Honer and his company and it provides a rough date for his interest in bicycle components.

• Publisher: Deutsches Patent- und Markenamt
• Inventor: Max Honer
• Country: Germany
• Date: Priority date August 1953
• Derailleur brands: Honer
• Derailleurs: none