A person or machine that makes copies of something.
From 'duplicate' with the suffix '-or', which denotes an agent (someone or something that performs an action). The word literally means 'one who doubles.'
Before photocopiers existed, office 'duplicators' were hand-crank machines that used stencils and ink to make copies—the Gestetner duplicator was revolutionary and changed how offices worked in the early 1900s.
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