Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Skinner's improved mask for anaesthesia, London, England, 18. Science Museum, London. Source: Wellcome Collection.

Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Skinner's improved mask for anaesthesia, London, England, 18. Science Museum, London. Source: Wellcome Collection.
