This is the US version of UK Patent # 451,722. I have only included it because, unlike the UK version, it is assigned to ‘Tri-Velox Gears Limited’. This is the earliest mention that I have found of TriVelox as a separate company from Triumph.

• Publisher: US Patent and Trademark Office
• Inventor: Valentine Page, assigned to Tri-Velox Gears Limited
• Country: USA
• Date: US application filed June 1936, UK application filed June 1935
• Derailleur brands: TriVelox
• Derailleurs: TriVelox A1