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''O 4'' was an patrol submarine of the Royal Netherlands Navy. The ship was built by ''De Schelde'' shipyard in Flushing, Netherlands. ==Service history== The submarine was ordered on 18 December 1911. On 15 June 1912 the ''O 4'' was laid down in Flushing'' at the shipyard of De Schelde. The launch took place on 5 August 1913. A passive sonar and two retractable periscopes were installed on the ship making it the first submarine in the Dutch navy having this equipment.〔 On 17 June 1914 the ship is commissioned in the navy. During World War I the ship was based in Flushing. Queen Wilhelmina visited the ship on 22 December 1914.〔 In 1935 the ''O 4'' was decommissioned.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「HNLMS O 4」の詳細全文を読む スポンサード リンク
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