When was William Henry Bragg employed at the University of Leeds and when did it end?
SELECT ?value1 ?value2 WHERE { wd:Q133747 p:P108 ?s . ?s ps:P108 wd:Q503424 . ?s pq:P582 ?value1 . ?s pq:P580 ?value2 }
william henry bragg: Q133747 university of leeds: Q503424