Group History　1935 - 1969 1935 Yoshinosuke forms the Aizawa Concrete Company, manufacturing and marketing concrete second products in Shizunai, Hokkaido, Japan. 1950 Shizunai production was switched to Civil engineering products, Fixtures, Fittings and Concrete products, as business rapidly expanded. 1963 Aizawa Concrete was formed with an initial investment of 10 million Yen, and production of concrete second products was established at a new plant in Shizunai, continuing to this day. 1964 Shizunai plant produced Hume Pipes receive JIS certification. 1966 Shizunai plant starts production and sales of RMC. 1967 Shizunai factory Japan Sewerage Society became. Shizunai plant is certified as a Japan Drainage Society plant. 1969 Biratori ( Furenai ) plant is established and RMC production and Sales start.