Haskell Pattern. Fig. 137, page 313, 'Dental Electricity' by Levitt E Custer, 1901.

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    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.

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