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Duplicator, any of various machines that make copies of two-dimensional materials from a master copy. Three of the most common duplicating machines are the spirit, the stencil, and the offset duplicator. As distinct from a photocopier, all three require the preparation of a master copy, a special form from which the copies are made.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Dream to Eijkman, Christiaan