List the origin of the weapons which were used in the American Revolutionary War.
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/usedInWar> <http://dbpedia.org/resource/American_Revolutionary_War> . ?x <http://dbpedia.org/property/origin> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Weapon>}
American_Revolutionary_War