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In page Norrköping-class missile boat:

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The initial armament was identical to the Spica class, comprising a Bofors 57 mm gun and six 533 mm (21 in) torpedo tubes. There was a refit programme in 1982–1985, where four launchers for RBS-15 anti-ship missiles replaced four torpedo tubes. Mines could be carried in place of the torpedoes or missiles. The 1982 refit also included new sensors (Sea Giraffe radar) and a new weapons control system (Maris 880).