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Imperial Japanese Navy Technical Department
The was the externally operating division of the Ministry of the Navy of Japan responsible for the administration of naval vessel construction. From 1923 onward, it took on the role of a research institution for the research and development of naval technologies and engineering. This included studying and investigating existing western naval technology, developing and overseeing Japan's domestic shipbuilding and arms industries, and training officers to become naval engineers and inspectors. The bureau was dismantled along with the naval ministry in November 1945 after Japan surrendered to the Allies at the end of World War II.
== Taishō period weapons==
The Department developed various weapons during the Taishō period. These were known a "Xth Year Type" weapons, with the year being the year of the Taishō Emperor's reign (dating from 30 July 1912 - 25 December 1926).〔(Japanese Torpedoes ), combinedfleet.com〕〔(Guns ), Mechanisms of Imperial Japanese Navy Warships in 3D, (based on information from "Naval Weapons of World War Two", John Campbell, Naval Institute Press, 1985), accessed 26 April 2010〕
This nomenclature followed on from Meiji period - the Meiji Emperor's reign (13 February 1867 - 30 July 1912). Records exist of a "8.0 inch 45 caliber, 41st Year Type" (1908).〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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