| Company | Ko-ken Tool Co., Ltd. |
| Address | 656 Nakaho, Kakegawa-City, Shizuoka-Pref., 437-1402 Japan |
| Foundation | December 15th 1946 |
| Establishment | August 1st. 1959 |
| December 1946 |
The founder Mr. Soichiro Yamashita established "Ko-ken Tool Company" |
| August 1959 |
Reorganized into Ko-ken Tool Co., Ltd. |
| February 1962 |
M.I.T.I. recognized the license of J.I.S. marking and shown on the Ko-ken products. |
| November 1965 |
Started direct export business. |
| February 1973 |
Started to exhibit at the Cologne Fair, in Germany. |
| May 1973 |
Factory and office were moved to 656 Nakaho, Daito-cho (Kakegawa) |
| August 1984-87 |
Exhibited at Chicago Hardware Show, in the USA. |
| June 1991 |
S.O.D.H. System was adopted for reversible ratchets. |
| April 1995 |
Heat treatment plant was renewed. |
| November 1995 |
The first Japanese tool manufacturer to obtain ISO 9002 Certification. |
| June 1997 |
Parts-former plant was built to install new forming machines. |
| June 1999 |
Obtained ISO9001 Certification. |
| October 2007 |
Used as official socket wrench at WorldSkills Competition. |
| November 2011 |
Installed solar power system (150kW). |
