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Uraga Dock Company was founded by Enomoto Takeaki in 1869. A shipyard had already existed in Uraga from the end of the Edo period.When Commodore Perry's flagship anchored off Uraga in 1854, one of the officials of the Tokugawa shogunate who boarded the American vessel was a trained shipwright, Nakajima Saburosuke.
In 1909, Japan's first domestically designed and produced battleship, Satsuma, was launched. The U.S. Navy base at the former Yokosuka Naval Arsenal (2004) Yokosuka became one of the main shipyards of the Imperial Japanese Navy in the 20th century, building numerous battleships such as Yamashiro, and aircraft carriers such as Hiryū and Shōkaku.
1995 – IHI and Sumitomo Heavy Industries merged a warship business and established Marine United Ltd. The Uraga Dock Company was the origin in the shipbuilding of Sumitomo Heavy Industries. It was made by Enomoto Takeaki. However, Sumitomo Heavy Industries moved Uraga Dock to Yokosuka in 2003.
On May 20, 2021, Sumitomo Heavy Industries revealed that design drawings for sample parts used in test machine guns for the Japan Ground Self-Defense Force had been leaked to China. The Ministry of Economy, Trade and Industry issued a severe warning to the company and its subcontractor for violating the Foreign Exchange and Foreign Trade Act.
I. Japanese submarine I-17; Japanese submarine I-29; Japanese submarine I-31; Japanese submarine I-36; Japanese submarine I-44; Japanese submarine I-54 (1943)
Aircraft designed by the arsenal are usually designated by the manufacturer's letter "Y" for "Yokosuka". [citation needed] An example of the above is the Yokosuka D4Y1 which was mainly produced by Aichi. The D4Y1 and later models were also produced by the 11th Naval Arsenal (Dai-Jūichi Kaigun Kōkū-shō) at Hiro. [1]
It is currently headquartered in Yokosuka, Japan, onboard United States Fleet Activities Yokosuka. CNFJ/CNRJ's area of responsibility extends from the southern tip of the Kamchatka peninsula to the northern tip of Taiwan and, the Singapore area of operations, and the Indian Ocean British Territory of Diego Garcia, but excludes the Korean peninsula.
The Port of Yokosuka (横須賀港, Yokosuka-kō) lies to the south of the Port of Yokohama on Tokyo Bay. Under the Ports and Harbors Law of Japan it is classified as an Important Port. The city of Yokosuka administers the port. The Port of Yokosuka has 100 berths of length 4.5 m or more.