Matches in DBpedia 2015-10 for { ?s ?p "The Saab 21R was a Swedish twin-boom fighter/attack aircraft made by Saab. It was a jet-powered development of the piston-engined Saab 21 which along with the Russian Yakovlev Yak-15 was one of the only two jet fighters successfully converted from a piston-powered aircraft to enter production.As a fighter, its service designation in the Swedish Air Force was J 21R, and saw service in the late 1940s."@en }
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- Saab_21R abstract "The Saab 21R was a Swedish twin-boom fighter/attack aircraft made by Saab. It was a jet-powered development of the piston-engined Saab 21 which along with the Russian Yakovlev Yak-15 was one of the only two jet fighters successfully converted from a piston-powered aircraft to enter production.As a fighter, its service designation in the Swedish Air Force was J 21R, and saw service in the late 1940s.".
- Saab_21R comment "The Saab 21R was a Swedish twin-boom fighter/attack aircraft made by Saab. It was a jet-powered development of the piston-engined Saab 21 which along with the Russian Yakovlev Yak-15 was one of the only two jet fighters successfully converted from a piston-powered aircraft to enter production.As a fighter, its service designation in the Swedish Air Force was J 21R, and saw service in the late 1940s.".