Company History
| September 1946 | The company was established at Nishi San-Cho, Hitachi Ota City, Ibaraki Prefecture. |
| September 1946 | The company started manufacturing parts for sewing machines and cameras. |
| September 1956 | The company started manufacturing parts for industrial measuring instruments. |
| February 1958 | The company was restructured to Sanyu Seisakusho Limited Company. |
| October 1959 |  The company inaugurated the Baba-cho Factory (current Head Office and Main Factory). |
| May 1964 | The company inaugurated the Branch factory in KUJI industry area at Hitachi City. |
| August 1969 | The company inaugurated the Second Plant at Sakae-Cho, Hitachi Ota City. |
| August 1974 | The company was restructured to Sanyu Co.,Ltd. |
| July 1978 | The company increased its capital to 20 million Yen. |
| December 1980 | The company constructed its design office at Head Office and Main Factory. |
| September 1984 | The company started manufacturing parts for medical analyzers. |
| March 1989 | The Second factory transferred to KUJI industry area (Branch factory). |
| August 1990 |  Precision Processing Center was constructed at the Branch Factory. |
| July 1994 | Head Office Plant was renovated. |
| July 1996 | The company started developing micro manipulators for fine processing jointly. |
| April 1998 | The company increased its capital to 30 million Yen. |
| September 1999 | The micro manipulator system was released in SPIE. |
| March 2000 | Our micro manipulator system was awarded the Technical Prize for Kanto Branch of the Japan Society of Mechanical Engineers. |
| December 2000 | The company installed the clean room office. |
| April 2003 | The company developed probers for EBAC. |
| March 2004 | The company developed manipulators for failure analyses in semiconductor devices. |
| April 2004 | The company started developing multi probers jointly with Advanced Industrial Science and Technology. |
| April 2006 | The company was certified under ISO 9001 (2000). |
| March 2007 | The company was certified with the Environment Management System KES. |
| October 2007 |  The Branch Factory was renovated. |
| December 2007 | The company increased its capital to 45 million Yen. |
| April 2009 | The company started developing Localized Plasma Etching System for failure analyses in semiconductor devices. |
| October 2013 | The company participated in Minimal Fab development Association. |
| July 2014 |  The company inaugurated the Technology Center in KUJI industry area. |
