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.