March 10, 1903 -- HARRY C. GAMMETER patented the multigraph machine and one of the founders the American Multigraph Co. On a sales trip to Cleveland he observed a stenographer endlessly copying circular letters and wondered if was possible devise a machine that would print a complete line or page of type with a single stroke. In 1900, he built a crude model of such a machine, demonstrating its feasibiliy to Clevelander Henry C. Osborn of the Osborn-Morgan Co. consulting engineers. Osborn designed, produced, and financed a duplicating machine based on the rotary drum principle which was patented 10 March 1903. Didja know? Soon after the company was founded Gammeter's health began to fail, and in an effort to recover, he developed Green Springs, Ohio as a health spa, but there's no trace of him in an internet search of the village.