what is the {start time} for {Giant Magellan Telescope} has {significant event} as {construction} ?
Which was the important role that was played by Giant Magellan in the field of Construction?
What is the significant role played by Giant Magellan Telescope in the field of Construction?
SELECT ?k WHERE { resource:Giant_Magellan_Telescope property:significant_event ?i . ?i property:significant_event resource:construction . ?i property:start_time ?k }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q652252> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P793> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q385378> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q652252 p:P793 ?s . ?s ps:P793 wd:Q385378 . ?s pq:P580 ?value}