6 portable stethoscopes. Robert's circa 1885, D and E- are similar to examples illustrated by Krohne and Sesemann, 1901

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: 6 portable stethoscopes. Robert's circa 1885, D and E- are similar to examples illustrated by Krohne and Sesemann, 1901. Wellcome Collection. Source: Wellcome Collection.