Haskell Pattern. Fig. 137, page 313, 'Dental Electricity' by Levitt E Custer, 1901.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Haskell Pattern. Fig. 137, page 313, 'Dental Electricity' by Levitt E Custer, 1901. Wellcome Collection. Source: Wellcome Collection.
