Established May 10, 1943 Yonbancho, Chiyoda-ku, Tokyo, Japan. Koken brand specializes in manufacturing and trading personal protective equipment. For Koken: "People are the highest value" With the criteria CLEAN, HEALTHY and SAFETY, at KOKEN, we always try our best to create unique and delicate products, contributing to the development of Koken. the growing development of society. Hanno Laboratory Basic research is done here. Inventions are used to make high-tech products with originality and creativity in the next 5 to 10 years and are presented in projects and international conferences.Techno-Yard Koken products are created in what we call “Techno-Yard”. Techno-Yard is described as a place to create value for customers, while “factory” is just a place for production. With advanced manufacturing technology and highly efficient control system, Techno-Yard constantly creates the most complete uniqueness.