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.
The process of refilling each tube took twenty-three seconds with the continuous wire and winch available. Hatsuharu was laid down on 14 May 1931, launched on 22 February 1933, and commissioned on 30 September 1933.