Anaesthesia: Nitrous Oxide Cylinder, 1939.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Anaesthesia: Nitrous Oxide Cylinder, 1939. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Anaesthesia: Nitrous Oxide Cylinder, 1939. Wellcome Collection. Source: Wellcome Collection.