Matches in DBpedia 2014 for { ?s ?p <http://dbpedia.org/resource/Category:Piston-engined_helicopters> . }
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- LCA_LH_212_Delta subject Category:Piston-engined_helicopters.
- Category:Four-engined_piston_helicopters broader Category:Piston-engined_helicopters.
- Category:Single-engined_piston_helicopters broader Category:Piston-engined_helicopters.
- Category:Twin-engined_piston_helicopters broader Category:Piston-engined_helicopters.