established.

History

In 1969, Sumitomo Computer Service Corporation was established by Sumitomo Corporation. In 2005, Sumitomo Computer Service Corporation and Sumitomo Electronics Corporation were merged into Sumitomo Computer System Corporation.

Separately, in 1968, CSK Corporation was established by Japanese entrepreneur Isao Okawa in 1968. The acronym CSK was derived from "Computer Service". CSK established CSK Research Institute, later

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