Question: What is the national origin of Dornier Aerodyne and Hirth Acrostar ?;
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
 SELECT DISTINCT ?uri WHERE { res:Dornier_Aerodyne prop:nationalOrigin ?uri. res:Hirth_Acrostar onto:origin ?uri}