| 1953 |
Commenced the joint development of special stainless alloys with Tohoku University. |
| 1955 |
Accomplished the development of special stainless alloys. |
| 1957 |
Commenced manufacturing springs for wristwatches. |
| 1968 |
Newly built a plant at Nishitaga, Taihaku-ku, Sendai-shi. |
| 1975 |
Commenced mass production of button-type microbatteries for wristwatches. |
| 1985 |
Formed an equal merger with Tochigi Koseki and changed its name to Seiko Electronic Components Ltd. |
| 1988 |
Commenced production of rechargeable button-type microbatteries. |
| 1994 |
Changed its name to SII Micro Parts Ltd. |
| 1995 |
Released rechargeable button-type microbatteries for cell phone backups. |
| 1995 |
Obtained ISO-9001 certification. |
| 1998 |
Relocated its main plant to the current address to enhance the production capacity. |
| 1999 |
Obtained ISO-14001 certification. |
| 1999 |
Announced rechargeable button-type microbatteries for digital camera backups. |
| 2000 |
Achieved the monthly shipment of 10 million rechargeable button-type microbatteries/capacitors. |
| 2003 |
Achieved the monthly shipment of 20 million rechargeable button-type microbatteries/capacitors. |
| 2005 |
Increased capital up to JPY 487.8 million yen for financial strength. |
| 2005 |
Accomplished the development of mercury-free silver oxide battery. |
| 2005 |
Relocated the sales office to Tokyo. |
| 2005 |
Newly built the second building in the headquarters. |
| 2006 |
Achieved the monthly shipment of 30 million rechargeable button-type microbatteries/capacitors. |
| 2007 |
Formed a merger with Seiko Instruments Inc. and became its Micro-Energy Division. |
| 2008 |
Relocated the sales office back to SII Head Office. |
| 2008 |
Announced the Chip type Electric Double Layer Capacitor. |