US 3,377,119 A↗1968Assignee: Canon Camera Co., Inc.Inventors: Eiichi TakanoSole exampleCANON FL 85-300mm f/5— 15 ELEMENTS / 9 GROUPS, DESIGN f = 87.74–292.45 mm
JP S55-124116 A↗1980Assignee: Tamron Co., Ltd.Inventors: Eiichi TakanoSole exampleTAMRON SP 70-150mm f/2.8 SOFT (51A)— 14 ELEMENTS / 10 GROUPS, DESIGN f = 71.72–147.36 mm