Victor Mouth Lamp for use upon the commercial current. Fig 155, page 353, 'Dental Electricity' by Levitt E Custer, 1901.

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: Victor Mouth Lamp for use upon the commercial current. Fig 155, page 353, 'Dental Electricity' by Levitt E Custer, 1901. Wellcome Collection. Source: Wellcome Collection.