This patent shows Shimano's somewhat feeble response to SunTour's sophisticated, but doomed, SunTour Superbe Tech design. You can feel that Masashi Nagano was not really interested, and I believe this design was never produced.

• Publisher: Japan Patent Office
• Inventor: Masashi Nagano
• Country: Japan
• Date: Priority date December 1982
• Derailleur brands: Shimano
• Derailleurs: a response to the SunTour GranTech