In the international variant of this patent the English language abstract says that it describes:

"A rear derailleur for a bicycle that is small, light, low in production cost and free from damage when the bicycle falls on the ground."

Even though this model was actually manufactured in Taiwan, the applicant for this patent is Maeda Industries Ltd. of Osaka, Japan.

• Publisher: Japan Patent Office
• Inventor: Yoshihisa Iwasaki
• Country: Japan
• Date: Priority date February 1992
• Derailleur brands: SunTour
• Derailleurs: unnamed SunTour under-chainstay derailleur