The curved plates on the bridge were also eliminated, and the smoke stacks were made of hexagonal elements instead of with a circular or oval cross-section. The hull was constructed using prefabricated sections which avoided the use of shaped steel or curved plates, which greatly reduced construction time. The Ukuru-class was a further simplification of the Mikura design. In addition to these, nine units and two additional unfinished ships belong to a sub-class called the Hiburi class and are included in the table below. Twenty vessels were commissioned two more ( Urumi and Murotsu) were launched by Uraga Dock and completed in August 1945 but were still uncommissioned by the war’s end. The first five of the new Ukuru-class were authorized under the 1941 Rapid Naval Armaments Supplement Programme and an additional six in the 1942 Modified 5th Naval Armaments Supplement Programme and nine under the 1944 Wartime Naval Armaments Supplement Programme. Furthermore, operational experience had shown that the Mikura-class was still very weak in its anti-aircraft capability. Despite being a simplified design, the Mikura-class vessels still took too long to construct, and due to the high attrition of Japan's destroyer and escort ships, action needed to be urgently taken to produce more ships in a quicker time. The Mikura class escort ship was developed after the start of the Pacific War, it became apparent that a design more capable of anti-submarine warfare than the previous Shimushu and Etorofu class kaibōkan was needed. The class was also referred to by internal Japanese documents as the "Modified B-class" coastal defense vessel ( 改乙型海防艦, Kai-Otsu-gata kaibōkan), and they were the fourth class of kaibōkan. The Ukuru-class escort ships ( 鵜来型海防艦, Ukuru-gata kaibōkan) were a class of twenty kaibōkan escort vessels built for the Imperial Japanese Navy during World War II. Shiga while she was preserved in Chiba City.
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