Each tube could be reloaded in twenty-three seconds using the endless wire and winch provided. Hatsuharu was laid down on 14 May 1931, launched on 22 February 1933 and commissioned on 30 September 1933.
Each tube could be refilled in twenty-three seconds using the never-ending wire and winch offered. Hatsuharu was laid down on 14 May 1931, launched on 22 February 1933, and commissioned on 30 September 1933.