Mimasaka Maru (Japanese: 美作丸) was a Japanese cargo ship during World War II.
History She was laid down in 1943 at the Tokyo shipyard of Ishikawajima Shipbuilding & Engineering Co. Ltd., for the benefit of Nippon Yusen Kabushiki Kaisha, Tokyo. She was one of 18 Wartime Standard Type B cargo ships laid down in 1943–1944 and one of seven built by Tokyo Ishikawajima ( (備前丸) (國陽丸), (備中丸), (美濃丸), (美保丸), Mimasaka Maru (美作丸), and (美山丸)). She was launched on January 9, 1944, and completed on February 6, 1944. On April 9, 1944, she was torpedoed and sunk by the American submarine near the Mariana Islands.
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