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{{PatentInfo |Inventor=Sadao Tokorozawa, Katsuji Iwasaki, Yoshio Aoki |Assignee=Pilot Man-Nen Hitsu Kabushiki Kaisha |Country=US |ApplicationNum=559448 |ApplicationDate=1966-06-22 |PatentNum=3399946 |PatentDate=1968-09-03 |PriorityDate=1966-02-25 |Tito...