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Corporate History
| Denka Company Limited Housing construction materials business |
Nakagawa Techno | |
|---|---|---|
| 1947 | Established Nakagawa Kinzoku Kogyosho | |
| 1955 | Started manufacturing metal rain gutters | |
| 1958 | Toyo Kagaku Released the industry's first PVC rain gutters | |
| 1969 | Acquired land for a factory in Kasai, Hyogo Prefecture, and started operation of Kasai Plant in 1970 | |
| 1975 | Consolidated all manufacturing operations into Kasai Plant Released stainless steel rain gutters | |
| 1998 | Transferred business to Nakagawa Techno and became a manufacturer of metal rain gutters, 80% owned by Toyo Kagaku (now Denka Company Limited) | |
| 2000 | Obtained ISO9001 certification | |
| 2003 | Merger between Denki Kagaku Kogyo and Toyo Kagaku | |
| 2015 | Denki Kagaku Kogyo changed its name to Denka Company Limited | Became a manufacturer of metal rain gutters, 100% owned by Denka Company Limited |
| Apr, 2021 | Established Denka Astec by merging the Housing Materials Department of Denka Company Limited and Nakagawa Techno | |