Question: Which producer of Purvis Eureka engine is also the owner of Ford Theatre ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Purvis_Eureka> <http://dbpedia.org/property/engine> ?uri. <http://dbpedia.org/resource/Ford_Theatre> <http://dbpedia.org/property/company> ?uri}