A "Roneo duplicator," also known as a stencil duplicator, was a popular printing machine in the past. This device allowed for mass production of documents by creating multiple copies from a master stencil. Although the term "Roneo duplicator" is specific to a brand, other synonyms can be used interchangeably. Notable alternatives include "spirit duplicator," which used a similar printing method, or simply "stencil machine" or "blueprinting machine." These terms highlight the core function of creating duplicate copies using a stencil. While the Roneo duplicator may be a lesser-known term today, these synonyms help us understand its historical significance and technological advancements in the field of printing.