| April, 1969 | Sanei Electronics Laboratory was founded. |
|---|---|
| September, 1971 | Company was renamed to SUN-A. |
| February, 1998 | The capital was increased to 4 million yen. |
| April, 2004 | Volume production of urea quality sensor was started as a subcontract from MITSUI MINING & SMELTING CO., LTD. |
| October, 2005 | Head office and Miyoshi factory was newly constructed at Miyoshi Industrial Park and started the operation. |
| May, 2007 | The advanced laboratory was founded and started the operation as a dedicated factory for urea quality sensor. |
| August, 2009 | Urea quality sensor business was transferred to SUN-A from MITSUI MINING & SMELTING CO., LTD. Sales has been started as our own brand. |
| February, 2010 | Fuel quality sensor was developed and put on the market. |
| December, 2011 | Saitama office was opened as a base office for sales of urea quality sensor. |
| September, 2012 | Custom power module business was transferred to SHINDENGEN ELECTRIC MANUFACTURING CO.LTD. |
| May, 2013 | The capital was increased to 310 million yen by receiving investment from Hiroshima Innovation Network Inc. The advanced laboratory was renamed to Miyoshi center, specialized to sensor business. |
| April, 2015 | Business-related patent rights has been inherited from MITSUI MINING & SMELTING CO., LTD. |
| August, 2015 | Kuriyama Corporation has become our parent company and principal shareholder instead of Hiroshima Innovation Network Inc. |