What is {employer} of {Jean-Baptiste Say} that is {start time} is {1831-1-1} ?
Jean-Baptiste Say was employed where from 1831?
Where did Jean-Baptiste Say work starting in 1831?
SELECT ?q WHERE { ?w property:start_time ?b . resource:Jean-Baptiste_Say property:employer ?w . FILTER ( CONTAINS ( YEAR ( ?b ) , '1831' ) ) . ?w property:employer ?q }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q13513> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P108> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1831-1-1>
} 

SELECT ?obj WHERE { wd:Q13513 p:P108 ?s . ?s ps:P108 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1831')) }