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The ships were designed by the Swedish Defence Materiel Administration (FMV) and built by Kockums AB. Construction began in 1996 at Kockums’ Kalrskrona yard. Visby (K31) ‘s lead ship was launched in June 2000 and delivered to the FMV in June 2002 to fit with weapons and combat systems. The second, HMS Helsingborg (K32), was launched in June 2003 and delivered in April 2006. Finally, Harnosand (K33) was launched in December 2004. HMS Visby and Harnosand were officially delivered to the FMV in June 2006. The other hulls are Nykoping (K34), launched in August 2005 and delivered in September 2006, and Karlstad (K35), launched in August 2006. Two corvettes, HMS Helsingborg and Harnosand, were delivered to the Swedish Navy in December 2009.
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https://news.cision.com/saab/r/saab-delivers-upgrade-gotland-class-submarine-to-sweden,c3256461
https://news.cision.com/saab/r/saab-signs-two-contracts-for-next-generation-corvettes-for-sweden,c3273408
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https://twitter.com/Forsvarsmakten/status/1587735330228256771
https://twitter.com/Saab/status/1587817195152752641/photo/1