Question: When did the Democratic Republic of Congo begin using the Flag of Zaire design?
Paraphrase: What did the Democratic Republic of Congo begin using the Flag of Zaire desig
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q974 p:P41 ?s . ?s ps:P41 ?x filter(contains(?x , 'Flag of Zaire.svg')) . ?s pq:P580 ?value}