Register All Cord Electric Engine. Fig 90, page 222,'Dental Electricity' by Levitt E Custer, 1901.

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    Licence: Attribution 4.0 International (CC BY 4.0)

    Credit: Register All Cord Electric Engine. Fig 90, page 222,'Dental Electricity' by Levitt E Custer, 1901. Wellcome Collection. Source: Wellcome Collection.

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