1923 Hand-made optical frame production started Shinichi Miwa 1926 Sankosha Frame Production established 1937 Sanko Kogyo Company Ltd. established Shinichi Miwa takes his post as director 1939 Tokyo branch office established 1940 First optical frame producer to manufacture celluloid frames 1941 Patinas frame production started 1944 Tokugawa, a royal chamberlain, inspects the company production facilities on behalf of Emperor Hirohito The gift for Emperor Hirohito 1947 Celebrate the visit of Emperor Hirohito 1957 Establish a branch factory of Sanko Sangyo Company Ltd. 1961 Branch factory becomes Sanko Sangyo Company Ltd. Yoichiro Miwa takes his post as director 1966 Sanko Sangyo Company Ltd. moves to a four-floor factory. a new four-floor building 1970 Win first place, "Gold Prize," in the first Japan Optical Frame Exhibition Rename Sanko Sangyo Company Ltd. to Sanko Kogaku Company Ltd. 1972 Have an agreement for technical cooperation with Nihon Kogaku (Nikon) 1973 Nihon Kogaku (Nikon) opens Fukui branch office in the Sanko building 1975 Win first place Good Design prize in Fukui Industrial Exhibition Change the organization from Sanko Kogaku company Ltd. to Sanko Kogaku Co. Ltd. 1976 Win the "New Advancement Prize" from the Minister of Labor for new advances in industry or technology 1979 Expand the mold-making division 1982 Start to work cooperatively with Beijing Optical Frame Division 1985 Introduce a Production Control computer system 1991 Company planning section established on the ninth floor of Optical Frame Hall Make a contract on license with "Valentino Rudy" 1993 Introduce CAD system in the planning section Introduce Form memory frame, "Slen D." Receive "Efficient Production Prize" from Fukui Labor Standard Division CAD system 1996 Slen D' Piero receives the first prize in the design section 2000 Introduce "DUN," Gum metal frame made of a new titanium alloy 2001 Hideki Miwa takes his post as director 2002 The planning section and the sales department are amalgamated NHK radio exercises 2003 Get the Good Organization prize from NHK radio in Japan