| 1987 | Jan | Established Sky Electronic Industry and started DD coil production. |
| Mar | Reorganized as Sky Electronics (株式会社スカイ電子) with capital of 5 million yen. |
| July | Printer coil production begins. |
| 1988 | Feb | Expand facilities to accommodate DD coil production. |
| May | Started production of linear motor coils. |
| June | Increase capital to 10 million yen. |
| Aug | Started production of VTR sensor coils. |
| Dec | Voice coil production begins. |
| 1989 | July | Expand facilities to accommodate increased production of printer coils. |
| Aug | Began production of injection coils for automobiles. |
| Oct | Ohnaro Plant to be newly established to accommodate production expansion. |
| Nov | Start production of CD pickup coils. |
| 1990 | Feb | Start production of HDD coils |
| June | Capital is increased to 15 million yen. |
| 1991 | Feb | Expand facilities to accommodate increased production of HDD coils |
| July | Expansion of Ohnaro Plant to accommodate increased production. |
| 1992 | Sept | Introduced new CD pickup coil model and automated production line |
| Nov | Installation of automated HDD coil production line |
| 1993 | July | Expanded Ohnaro Plant No. 2 and consolidated the main plant into the Ohnaro Plant. |
| Oct | Install a rigid injection molding machine |
| Nov | VTR capstan coil molding goes into production |
| 1994 | Jan | Started production of HDD rotor molding |
| 1995 | Oct | Reduced production of CD pickup coils |
| 1996 | May | Began production of DD coils for telecommunications equipment and expanded facilities |
| July | Begins production of choke coils for telecommunications equipment |
| 1997 | May | Capital participation in PRONEC(THAILAND)CO. |
| 1998 | Mar | HDD rotor molding and production to resume. |
| 1999 | Jan | Became a certified company under the Law for the Promotion of Creative Activities of Small and Medium Enterprises |
| Apr | Participated in a joint industry-government-academia local clean energy committee |
| 2000 | June | Capital increased to 20 million yen. |
| 2001 | Aug | Start trial production of small generator for wind power |
| 2002 | Feb | Completion of the first SKY-B350 small generator for wind power |
| May | PRONEC(THAILAND)CO.,LTD. capital withdrawal |
| 2004 | Jan | Outer Rotor Generator begins external sales. |
| 2006 | Nov | Started sales of Hybrid Evacuation Guidance Light |
| 2007 | Oct | Completed “Enetre” bicycle power generator |
| 2008 | June | Completed H series outer rotor generator |
| 2009 | Mar | Completion of the first 20kW generator SKY-MG450W4 |
| | Started sales of inner rotor generators |
| July | Capital increased to 25 million yen |
| 2010 | Jan | Bellsion Sky Evacuation Guidance Lamps go on sale |
| May | Capital increased to 30 million yen. |
| 2012 | Apr | Yonago Lab opened. Started development of electronic control for generators. |
| Nov | Controls for generators:Controls for solar power generators Completed and put on sale |
| 2013 | Jan | Started sales of Solar Sky evacuation guide light |
| 2014 | Jun | Capital increased to 37 million yen. |
| 2024 | July | Started sales of emergency power supply units |
