Photograph of a Engstrom respirator Modell 1
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Photograph of a Engstrom respirator Modell 1. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Photograph of a Engstrom respirator Modell 1. Wellcome Collection. Source: Wellcome Collection.