1983 Aug Established as a manufacturer and supplier of stroboscope transformers for overseas markets
Dec Started production and supply of stroboscope transformers to the domestic market
1984 Mar Started production and supply of transformers for high frequency switching power supplies
1985 Jan Increased the capital from 5million yen to 10million yen
1986 Nov Moved its main office to Hino-shi, Tokyo
1987 May Started production and supply of lighting inverter transformers
1989 Dec Increased the capital to 30.4million yen with the progress of the achievements.
Sep Established the Thailand factory in Lamphun, Thailand
1991 Sep Established Yamanashi branch office in Tsuru-shi, Yamanashi
1993 May Increased the capital to 32million yen with the progress of the achievements.
1995 Aug Established the joint venture company in Dan Dong city, Liao Ning Province, P. R. China
Oct Begun design and production of Power Inductor coils
1996 Apr Established Hong Kong office
Jul Moved the head office from Hino-shi, Tokyo to Hachioji-shi, Tokyo
1997 Feb Thailand factory obtained ISO9002 certification
1999 Mar Laos factory started the mass production
May Transferred the Yamanashi branch operation to overseas plant
Nov Started mass production and shipment of surface-mount type stroboscope transformers for digital cameras
2000 Jan Started supply of SMD choke coils
Feb Thailand factory obtained ISO9001:2000 certification
Mar Started mass production and shipment of subminiature trigger coils; succeeded in miniaturization of the volume by 30%
Apr Started large-scale delivery of inverter transformers at 250,000 units/month
May Started mass production and shipment of high withstand voltage trigger coils
Aug Started mass production and shipment of surface-mount type choke coils with complete magnetic shielding; Improved the characteristics by 1.5 times compared with the previous models.
2001 Jul Started shipment of small and low strobe transformers
2002 Feb Started shipment of encapsulated trigger coils
Dec Started shipment of trigger coils to cope with miniature reflow type
2004 Aug Thailand factory obtained ISO14001:1996 certification
Oct Established Kansai Branch
2005 Mar Established Tokyo Coil Hong Kong Ltd., Shenzhen office
 Oct Started shipment of ultra-miniature booster transformers Started shipment of metallic Power Inductor coils
Dec Laos factory obtained ISO9001:2000 certification
2006 Developed and shipped LCD TV Power transformers, CCFL backlight balance transformers
2007 Started full-scale production of Power transformers and balance transformers for liquid crystal TV
Aug Thailand factory obtained ISO14001:2004 certification
Dec Laos factory obtained ISO14001:2004 certification
2009 Feb Thailand factory obtained ISO9001:2008 certification
2010 Nov Laos factory obtained ISO9001:2008 certification
2012 Feb Building Product Automation of Power Inductor SHP series in Thailand factory
2013 Intensive Transformer/Triggercoil for Strobe in Laos factory
2014 Quality Control and Production Management by IoT
2015 Started production by labor-saving (smart line system)
Sep Establishment of Nagoya Bussiness Office (from Kansai brunch relocate)
2016 Establishment of TW Thailand (TWT) Co.,Ltd
Started Product Automation of All SHP series in Thailand factory
Aug Thailand factory obtained ISO14001:2015 certification
Dec Laos factory obtained ISO14001:2015 certification
2017 Joint-venture of DCE (Dangdong Dadong Coil Engineering Co.,Ltd.) was dissolved
Started Production of Nickel Ferrite Core
in Thailand factory
Dec Laos factory obtained ISO9001:2015 certification
2018 Feb Thailand factory obtained ISO9001:2015 certification
2018 May Laos factory obtained Sony Green partner certification
2018 Aug Thailand factory obtained IATF16949:2016 certification

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