| 1935 |
The predecessor of Shin Den Gen traces back to Den Gen Sha, an electric furnace manufacturer founded in 1935. The company began producing selenium rectifiers as well as electric furnaces. |
| 1944 |
To respond to military demand expansion during the Pacific War, established Den Gen Kogyo Co., Ltd. in 1944 as a dedicated selenium rectifier manufacturer. |
| 1949 |
After the war, Den Gen Kogyo resumed manufacturing selenium rectifiers amid factory closures, and later produced rectifier elements and DC power supplies. |
| 1949 |
In 1949, Shin Den Gen Kogyo Co., Ltd. was established inheriting the rectifier division, with a capital of 5 million yen, starting with 465 employees transferred from Den Gen Kogyo. |
| 1949-08-16 |
Established: August 16, 1949 (Showa 24) |
| 1949-08-16 |
Established. |
| 1952 |
Introduction of alloy-germanium transistors. |
| 1957 |
Completed alloy-germanium transistors for rectification. |
| 1960 |
Completed prototype silicon thyristors. |
| 1961 |
Started sales of 16A/400V silicon thyristors. |
| 1962-11 |
Founded in November 1962. |
| 1962-11-10 |
Founded on November 10, 1962, as Sankō Electric Co., Ltd., the predecessor of Shinden Gen Three E Co., Ltd., in Inari-cho, Hannō City. |
| 1967-04 |
In April 1967, started production consignment of titanium capacitors and amp cut fuses from Shinden Gen Industries Co., Ltd. |
| 1969-02 |
In February 1969, started production consignment of electronic devices and small rectifiers from Shinden Gen Industries Co., Ltd. |
| 1973-12 |
In December 1973, dispatched management personnel from Shinden Gen Industries Co., Ltd. |
| 1988 |
Established Shin Den Gen Thailand (SDT) and began overseas production. |
| 1991 |
Established Lampoon Shin Den Gen (LSD) near Chiang Mai in northern Thailand. |
| 1991-07 |
In July 1991, became a wholly owned subsidiary of Shinden Gen Industries Co., Ltd. |
| 1992-11 |
In November 1992, renamed to Shinden Gen Three E Co., Ltd. |
| 1995-04 |
In April 1995, merged headquarters and Kawaji Factory and relocated to Sōyanagi, Hannō City. |
| 1995-04 |
Due to the impact of a strong yen, overseas export ratio increased, leading to the establishment of LSD and SDP to expand overseas production. |
| 1996-08 |
In August 1996, obtained ISO 14001 certification. |
| 1996-12 |
In December 1996, obtained NQAS certification. |
| 1999-03 |
In March 1999, obtained ISO 9002 certification. |
| 1999-10 |
In October 1999, established Minami-machi Factory inside Shinden Gen Industry Hannō Factory. |
| 2001-07 |
In July 2001, merged with Wa Electric Co., Ltd., and established Honmachi Business Office. |
| 2002-08 |
In August 2002, obtained ISO 9001 2000 edition transition certification and relocated headquarters to Ashigariba, Hannō City. |
| 2004-01 |
In January 2004, integrated ISO 9001 2000 edition with Shinden Gen PS Business Headquarters. |
| 2004-04 |
In April 2004, merged with Yamagata Shinden Gen Co., Ltd. and Koma Electronic Industry Co., Ltd. |
| 2007-04 |
In April 2007, relocated the Maintenance Service Center Honmachi Business Office to Kōrai Factory. |
| 2012 |
Established an independent department for power modules. |
| 2012-11 |
Celebrating its 50th anniversary in November 2012. |
| 2015-04 |
In April 2015, the logistics division of Shin Den Gen Logistics Co., Ltd. was spun off and inherited. |
| 2016-12 |
In December 2016, Shin Den Gen Three E Logistics Center (SBC) was established. |
| 2018-12 |
In December 2018, production at Minami-machi Factory was relocated to the head office Ashigariba Factory. |
| 2021-03 |
In March 2021, production at Koryo Factory was relocated to the head office Ashigariba Factory. |
