Matches in DBpedia 2015-10 for { ?s ?p "The Ilyushin I-21, (Istrebitel-21, fighter-21), was a single-engined, single-seat fighter produced in the USSR in 1936-7 in response to a government specification.It was an all-metal, low-wing, cantilever monoplane with retractable undercarriage and closed cockpit. The wings were sharply tapered with straight trailing edges, which introduced sweep back on the leading-edge."@en }
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- Ilyushin_I-21 comment "The Ilyushin I-21, (Istrebitel-21, fighter-21), was a single-engined, single-seat fighter produced in the USSR in 1936-7 in response to a government specification.It was an all-metal, low-wing, cantilever monoplane with retractable undercarriage and closed cockpit. The wings were sharply tapered with straight trailing edges, which introduced sweep back on the leading-edge.".