In 1896, the first U.S. patent for an addressing machine, the Addressograph was issued to J.S. Duncan of Sioux City, Iowa. It was a development of the invention he had made in 1892. His earlier model consisted of a hexagonal wood block onto which he glued rubber type which had been torn from rubber stamps. While revolving, the block simultaneously inked the next name and address ready for the next impressionoun The "Baby O" model was put into production on the 26 Jul 1893 in a small back room of the old Caxton Building in Chicago, Illinois.