Risograph

Risograph is a high-speed digital printing system manufactured by the Riso Kagaku Corporation and designed mainly for high-volume photocopying and printing. Increasingly, Risograph machines have been commonly referred to as a RISO Printer-Duplicator, due to their common usage as a network printer as well as a stand-alone duplicator. When printing or copying multiple quantities (generally more than 20) of the same original, it is typically far less expensive per page than a conventional photocopier, laser printer, or inkjet printer. Printing historian Rick O'Connor has debated that the original, and thus correct, name for the device is RISSO and not RISO. This debate spawns from the notion that an extra 'S' is added because the inventor's wife found it more pleasing to the ears.