The pulsemeter.
Geoffrey Kaye Museum of Anaesthetic History.
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Westhorpe
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C
Ball
D000776:Anesthesiology / Q000266:history* / Q000295:instrumentation*; D004867:Equipment Design; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008991:Monitoring, Physiologic / Q000266:history* / Q000295:instrumentation*; D011674:Pulse / Q000266:history* / Q000295:instrumentation*