Finally this 2017 Taiwanese patent details the design of the FSA K-Force WE electronic derailleur. It is the last of a series that, working back through time, includes Taiwanese Patent # 201520126, Taiwanese Patent # 201136802, Taiwanese Patent # 201121842, a selection of Tiso patents and, arguably at the very start, SunTour's US Patent # 4,469,479 with a priority date back in 1981!

• Publisher: Taiwan Intellectual Property Office
• Inventor: Vince Tsai and Alfredo Sala
• Country: Taiwan
• Date: Priority date May 2017
• Derailleur brands: FSA
• Derailleurs: FSA K-Force WE