1941Nikko Seisakusho established in Kanda-Sudacho, Tokyo
1952Shimomura Seisakusho Co., Ltd. established
1958Changed name to Shimomura Seisakusho Seiko Co., Ltd.
1959The Daido Steel Co., Ltd. invests in the Company.
1962Formed a partnership with Daido Steel Co., Ltd. for material supply and other areas.
Head Office Plant constructed in Miyakubo, Ichikawa City
1970Kamagaya Plant constructed in Kamagaya City
1973Matsuo Plant constructed in Sammu City
1981Head Office and Sales Division relocated to Ichikawa, Ichikawa City
1982Fujimi Plant constructed in Sammu City, Kamagaya Plant relocated
1990Oriental Shimomura Drawing established in Penang, Malaysia
1996ISO 9002 certification acquired
1999SPACE system introduced
2000Shimomura mergers with Chiba Seiki Co., Ltd., manufacture and sale of tool steel begins
2002Shimomura Tokushu Seiko Suzhou Co., Ltd. established in Suzhou City, Jiangsu Province, China
2004ISO 14001 certification acquired
2006Osaka Sales Office integrated with Nagoya Sales Office, Suwa Sales Office integrated with Head Office Sales Division
2009SMK Project kicked off
2010Nagoya Plant opens
2011Quality and environmental ISO are re-examined and integrated, then started as IMS
2013Combined II begins operation as Shimomura Tokushu Seiko Suzhou
2015Solar power introduced at Matsuo Plant
Shimomura Tokushu Seiko Suzhou acquires TS 16949 certification
2017Launch of a blanking plant for ballpoint pen tips at the Matsuo plant
2019Daido Shimomura Steel Manufacturing Co., Ltd (DSST) established in Chonburi, Thailand
2020Nagoya Plant (Second Plant) opens
