What is {manager/director} of {European Southern Observatory} that is {end time} is {1974-1-1} ?
Who is {manager/director} of {European Southern Observatory} where {conclusion time} is {1974-1-1} ?
Who is {manager/director} of {European Southern Observatory} where {end time} is {1974-1-1} ?
SELECT ?z WHERE { ?u property:director_/_manager ?z . FILTER ( CONTAINS ( YEAR ( ?j ) , '1974' ) ) . ?u property:end_time ?j . resource:European_Southern_Observatory property:director_/_manager ?u }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q151991> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1037> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P582> <1974-1-1>
} 

SELECT ?obj WHERE { wd:Q151991 p:P1037 ?s . ?s ps:P1037 ?obj . ?s pq:P582 ?x filter(contains(YEAR(?x),'1974')) }