Who are the maintainers of the bridges which cross the pandaruan river?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/crosses> <http://dbpedia.org/resource/Pandaruan_River> . ?x <http://dbpedia.org/ontology/maintainedBy> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Bridge>}
Pandaruan_River