From when and until when was Irving Thalberg married to Norma Shearer?
SELECT ?value1 ?value2 WHERE { wd:Q438472 p:P26 ?s . ?s ps:P26 wd:Q95019 . ?s pq:P580 ?value1 . ?s pq:P582 ?value2 }
irving thalberg: Q438472 norma shearer: Q95019