SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/material> <http://dbpedia.org/resource/Concrete> . ?x <http://dbpedia.org/ontology/builder> ?uri . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Bridge>}
Which builder has made concrete bridges?
SELECT DISTINCT ?f WHERE { ?q property:builder ?f . ?q property:material resource:Concrete . ?q rdf:type ontology:Bridge }
Dominion Bridge Company, Iran, France, Broadspectrum, McConnell Dowell, John Holland Group, Grupo Garza Ponce, Daelim, Seymour Whyte
The builders of the bridges with concrete are [Dominion Bridge Company, Iran, France, Broadspectrum, McConnell Dowell, John Holland Group, Grupo Garza Ponce, Daelim, Seymour Whyte].
Concrete Bridge Builders - [Dominion, Bridge Company, Iran, France, Broadspectrum, McConnell Dowell, John Holland Group, Grupo Garza Ponce, Daelim, Seymour Whyte].