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US Patent # 4,193,309

Inventor: Masashi Nagano

Assigned to: Shimano

US application filed: July 1976

Japanese applications filed: from August 1975

Relates to: Shimano Positron

US_Patent_4,226,131_-_SunTour_Tech_system.html
US_Patent_4,132,119_-_Shimano_Positron.html