High Quality Content by WIKIPEDIA articles! 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.