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

    Date:
    [1925?]
    Reference:
    569214i

    Licence: In copyright

    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. Source: Wellcome Collection.

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