| 1933 July | Established as the Ohkura Electric Research Institute, an affiliate of the Henmi Bamboo Slide Rule Campany. |
|---|---|
| 1936 December | Incorporated as the Ohkura Electric Research Institute, Ltd. with capital of JPY300,000. |
| 1943 December | Changed company name to Ohkura Electric Co.,Ltd. |
| 1947 February | Built Tokyo Factory in Suginami-ku, Tokyo |
| 1962 October | Listed on the Second Section of the Tokyo Stock Exchange with capital of JPY260 million. |
| 1964 February | Built Sakado Factory in Sakado, Saitama |
| 1984 May | Opened the Wako Technology Center in Wako Saitama. |
| 1984 October | Increased capital to JPY2,327.2 million. |
| 1986 September | Listed on the First Section of the Tokyo Stock Exchange. |
| 1986 December | Built Misato Factory in Misato-Machi, Kodama-gun, Saitama |
| 1988 October | Increased capital to JPY4,061.2 million. |
| 1990 October | Built Hokkaido Plant in Eniwa, Hokkaido. |
| 1997 February | Accredited under ISO 9001 |
| 2001 May | Moved the head office to Wako, Saitama |
| 2001 October | Reorganization process was begun under the Japanese civil rehabilitation law |
| 2002 January | Sold the Telecommunication Systems Department |
| 2002 June | Decreased capital to JPY10 million |
| 2002 July | Moved the head office to Misato, Saitama |
| 2002 August | Completed the reorganization process under the Japanese civil rehabilitation law. |
| 2003 January | Accredited under ISO 9001 /2000(Misato Head Office/Factory) |
| 2004 April | Built head office/factory in Sakado, Saitama |
| 2005 January | Accredited under ISO14001/1996(Sakado Head Office/Factory) |
| 2005 August | Built second factory in Sakado,Saitama |
| 2006 Febrary | Accredited under ISO14001/2004(Sakado Head Office/Factory). |
| 2010 November | Accredited under ISO9001/2008(Sakado Head Office/Factory/Branch Office) |
| 2013 November | Ohkura Electric Co., Ltd became a consolidated Subsidiary of Y.A.C. Co., Ltd. through stock acquisition |
| 2017 August | Accredited under ISO9001/2015(Company-wide) |
| 2018 May | Accredited under ISO14001/2015(Company-wide) |
| 2023 September | HOUSYOU SANGYOU INC. becomes a consolidated subsidiary. |
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