title: Brunel's half-sovereign.
mesh_terms: D000402:Airway Obstruction / Q000266:history; D002498:Centrifugation; D004739:England; D005547:Foreign Bodies / Q000266:history* / Q000628:therapy; D006666:History of Medicine; D006801:Humans; D008297:Male; D012399:Rotation; D014132:Trachea