Walton-Minnitt Gas Air Apparatus circa 1937
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Walton-Minnitt Gas Air Apparatus circa 1937. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Walton-Minnitt Gas Air Apparatus circa 1937. Wellcome Collection. Source: Wellcome Collection.