This patent is the US version of German Patent # 636,794. I have included it because, unlike the German version, it includes the name of the inventor - Franz Winkler.

• Publisher: US Patent and Trademark Office
• Inventor: Franz Winkler (Fichtel & Sachs)
• Country: USA
• Date: US application filed January 1935, German application filed January 1934
• Derailleur brands: Fichtel & Sachs
• Derailleurs: Fichtel & Sachs 9/a