Electrocardiography at children's hospital, 1930s. The electrocardiograph at centre is from the Cambridge instrument company. Photographed in a childr

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Electrocardiography at children's hospital, 1930s. The electrocardiograph at centre is from the Cambridge instrument company. Photographed in a children's hospital circa 1937.

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Size: 4527px × 3935px
Photo credit: © LIBRARY OF CONGRESS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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