Stethoscopes. A- perhaps Stoke's type with ivory ear plate. B, C, D, -probably all English versions of the Piorry stethoscope dating from 1830s to 1840s.

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Stethoscopes. A- perhaps Stoke's type with ivory ear plate. B, C, D, -probably all English versions of the Piorry stethoscope dating from 1830s to 1840s. Wellcome Collection. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.