What is <designed by> of <William Boeing> ?
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What has William Boeing designed?
SELECT DISTINCT ?n WHERE { ?n property:designed_by resource:William_Boeing }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>  ?answer. ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P287> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q214826>. }
select distinct ?answer where { ?answer wdt:P287 wd:Q214826}
B-1 B & W Seaplane