What is {chief executive} of {manufactured by} of {IBM 7030 Stretch} ?
Who is chief executive of the  manufacturer of IBM 7030 Stretch?
Who is {chief executive} of {manufacturer} of {IBM 7030 Stretch} ?
SELECT ?u WHERE { resource:IBM_7030_Stretch property:manufacturer ?i . ?i property:chief_executive_officer ?u }
SELECT ?answer WHERE { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q984038> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P176>. ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?X . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?X. ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P169> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer . }
SELECT ?answer WHERE { wd:Q984038 wdt:P176 ?X . ?X wdt:P169 ?answer}
Arvind Krishna