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US Patent # 4,226,131

Inventor: Kazuto Yamasaki

Assigned to: SunTour

US application filed: October 1978

Japanese applications filed: October 1977

Relates to: SunTour Tech 3 pivot system

US_Patent_4,274,828_-_Huret_Challenger_etc.html
US_Patent_4,193,309_-_Shimano_Positron.html