Gammeter Multigraph
From Graces Guide
c.1900 Harry C. Gammeter (c.1870 - 11 April 1937) constructed the prototype for a printing machine using a rotary drum, which allowed circular letters or invoices to be printed. He demonstrated it to Henry C. Osborn of the Osborn-Morgan Co., who produced and patented a duplicating machine based on the rotary drum principle. Gammeter and Osborne set up the American Multigraph Company in 1902, manufacturing the machine in Cleveland.[1]
1909 The Gammeter Multigraph multiple type writer and office printing machine was shown at the Olympia Business Exhibition by the International Multigraph Co[2] which was based in London[3]
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