TSK Division
(TSUKAMOTO SEIKI CO.,LTD.)
- March 1919
- Established TSUKAMOTO SHOJI.
- December 1942
- The company changed its name to TSUKAMOTO SEIKI KAISHA LTD.
- September 1952
- Succeeded in development of various type of deep well drilling rock bits, Tool and measuring equipment.
- September 1969
- Obtained API License.
- August 1977
- Established Kashiwazaki Factory in Kashiwazaki, Niigata and relocates manufacturing operations to Kashiwazaki Factory.
IKS Division
(ITABASHI KIKAI SEISAKUSHO CO.,LTD.)
- November 1956
- Established ITABASHI SEISAKUSHO.
Manufacture petroleum resources development, Valves and Wellheads.
- March 1958
- The company changed its name to ITABASHI KIKAI SEISAKUSHO CO.,LTD.
- March 1963
- Concluded a technical tie-up with ACF Industries in the USA.
Started manufacturing W-K-M brand high pressure valves for Oil and Natural gas.
- December 1966
- Obtained API License.