US 3,506,339↗1970Assignee: Asahi Kogaku Kogyo Co., Ltd.Inventors: Tomokazu KazamakiSole examplePENTAX SUPER-TAKUMAR 28mm f/3.5— 7 ELEMENTS / 7 GROUPS, f = 28.000 mm
JP 1955-009472 B↗1955Inventors: Tomokazu Kazamaki, Fumio KondoSole exampleKONICA HEXANON 135mm f/3.5— 4 ELEMENTS / 4 GROUPS, f = 134.995mm DESIGN