| 1975 (February) |
Sony-Eveready established as joint venture between Sony Corp. and Union Carbide Corp. of USA. |
| 1986 (April) |
Joint venture with Union Carbide Corp. dissolved and name changed to Sony Energytec. |
| 2000 (August) |
Sony Energytec merged with Sony Motomiya to form Sony Fukushima. |
| 2004 (July) |
Sony Fukushima merged with Sony Tochigi to form Sony Energy Devices Corp. |
| 2017 (September) |
Established production company, Tohoku Murata Manufacturing Co., Ltd. |