High Quality Content by WIKIPEDIA articles! Duplicating machines were the predecessors of modern document-reproduction technology. They have now been replaced by digital duplicators, scanners, laser printers and photocopiers, but for many years they were the primary means of reproducing documents for mass distribution. Like the typewriter, these machines were children of the second phase of the industrial revolution which started near the end of the 19th century. This second phase brought to mass markets things like the small electric motors and the products of industrial chemistry without which the duplicating machines would not have been economical.

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