a rotary duplicator that uses a stencil through which ink is pressed (trade mark Roneo)
An invention of Thomas A. Edison, a machine for making printed copies, using typed stencil, ubiquitous until the 1990s when photocopying became competitive (if not cheaper), and considerably easier to use
a rotary duplicator that uses a stencil through which ink is pressed (trade mark Roneo) print copies from (a prepared stencil) using a mimeograph; "She mimeographed the syllabus