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US Patent # 3,974,707

Inventor: Masashi Nagano

Assigned to: Shimano

US application filed: March 1975

Japanese applications filed: from August 1974

Relates to: Shimano Positron

US_Patent_4,002,080_-_Huret_Duopar.html
US_Patent_3,973,447_-_Shimano_Eagle.html