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U20 (HAVMANDEN) class submarine
- 1916-SMU 21, Built, Ungarische Unterseebotsbau AG (UBAG) , Keel laid: 1915.12.06. Launched: 1916.08.15. Delivered: 1917.08.15.1917-SMU 22, Built, Ungarische Unterseebotsbau AG (UBAG) , Keel laid: 1915.12.??. Launched: 1917.01.27. Delivered: 1917.11.23.