横須賀海軍工廠
Two of the three vessels ("Maya" and "Akagi") were built by the private-contractor, Onohama Shipyards in Kobe (a predecessor of Hitachi Zosen Corporation), and one ("Chōkai" ) was by built by the private-contractor Ishikawajima-Hirano Shipyards. "Atago" was built by the government’s Yokosuka Naval Arsenal