Question: Which company had built the rockets launched at the Cape Canaveral Air Force Station Space Launch Complex 17?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/launchSite> <http://dbpedia.org/resource/Cape_Canaveral_Air_Force_Station_Space_Launch_Complex_17> . ?x <http://dbpedia.org/ontology/manufacturer> ?uri  . }
Answer: The manufacturers of the rockets launched at the Cape Canaveral Air Force Station Space Launch Complex 17 are [Boeing, Douglas Aircraft Company, Aerojet].