What is {position held} of {Nelson Rockefeller} that is {end time} is {1973-12-18} ?
When did Nelson Rockefeller end his term?
did nelson rockefeller end his term in 1973-12-18?
SELECT ?m WHERE { ?t property:position_held ?m . ?t property:end_time ?t . resource:Nelson_Rockefeller property:position_held ?t . FILTER ( CONTAINS ( YEAR ( ?t ) , '1973' ) ) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q11237> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P39> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P582> <1973-12-18>
} 

SELECT ?obj WHERE { wd:Q11237 p:P39 ?s . ?s ps:P39 ?obj . ?s pq:P582 ?x filter(contains(YEAR(?x),'1973')) }