"In the post-war years the Royal Swedish Navy developed a conventional straight-running heavy weight torpedo as the Tp (Torpedo) 14 for surface ships and the production version, Tp 141, was followed by the wire-guided Tp 142. For submarine use there was the Tp 27, introduced in 1960 as the Tp 271 and followed by the Tp 272. In 1960, Sweden acquired from the United Kingdom details of High-Test Peroxide (HTP) designs for torpedoes developed from the Mark 12 (Fancy SR) which was abandoned in 1959. Although the British had considerable problems with HTP the Swedes did not and the HTP technology was incorporated into the Tp 61 family of anti-surface vessel torpedoes of which the first version appeared in 1966 as the wire-guided Tp 611. Versions of this weapon, which appeared later, were the Tp 612 (and a derivative of the Tp 618) then the Tp 613 and its export version the Tp 617. In the late 1980's, FFV (later Bofors Underwater Systems then Swedish Ordnance and now Bofors) began to develop the dual-purpose heavyweight Torpedo 2000). The weapon which will be designated Tp 62, was scheduled to enter service circa 1995, but the contract was not signed until December 17th 1997. Deliveries were to begin in early 2000. A tropicalised export version was designated Tp 96 but was renamed Torpedo 2000."