To Tsuruoka, the hometown of the company's founder

In 1960, Sashida Seisakusho, an affiliate of Suntec, was founded in Ome City, Tokyo. This was at a time when the industrial parks formed in the eastern part of Ome City contributed greatly to the development of the local economy as the major electrical and machinery industries. In 1985, when Sashida Seisakusho set out to expand its business, soaring land prices and a shortage of human resources made expansion in Ome City no longer feasible, and the company decided to relocate and decentralize its plant to the founder's hometown of Tsuruoka.

1985	July Acquired factory site from Tsuruoka City. Hired local employees and provided them with training at Sashida Seisakusho in Ome for about 3 years.
1988	October Completion of the Building No. 1 and start of operations
1990	November Completion of Building No. 2
1998	January Eastern part of Building No. 3 completed
2001	July Western part of Building No. 3 completed (office and dining room)
2006	July (Western part of) Building No. 1 expanded
	June (Welding plant in western part of) Building No. 2 expanded
2008	April ISO 9001 Certification acquired
2009	January Building No. 1 and No. 2 expanded
2012	February No. 2 Plant acquired
2016	February Factory site in Kushibiki-West Industrial Complex in Tsuruoka City acquired
2018	May Kushibiki Plant newly established
2021	May Building No. 2 of the Kushibiki Plant expanded
2022	March Factory site in the Shonai South Industrial Complex in Tsuruoka City acquired
	May Building No. 3 of the Kushibiki Plant expanded
2023	February Shonan Plant newly established
	February Building No. 2 of the Shonan Plant expanded