Karel Frederic Wenckebach demonstrates a boy's heartbeat to a medical class: students listen through stethoscopes connected to a machine. Process print, ca. 1925.

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Credit

Karel Frederic Wenckebach demonstrates a boy's heartbeat to a medical class: students listen through stethoscopes connected to a machine. Process print, ca. 1925. Wellcome Collection. In copyright. Source: Wellcome Collection.