Gwathmey's water sight-feed.
Geoffrey Kaye Museum of Anaesthetic History.
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Ball
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Westhorpe
D000776:Anesthesiology / Q000266:history* / Q000295:instrumentation; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D012955:Societies, Medical / Q000266:history; D014481:United States