Monaural stethoscope designed by Duckworth (?).
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Monaural stethoscope designed by Duckworth (?). Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Monaural stethoscope designed by Duckworth (?). Wellcome Collection. Source: Wellcome Collection.