It was finished soon after New Year's Day, 1885. This prototype, called the macaroni box, is in the Smithsonian Institution in Washington, D.C., United States. Shortly after, Robert Tarrant, the owner of a Chicago workshop, gave Mr. Felt a salary of $6 a week, a bench to work on and what would add up to $5,000 to build his first practical machine which he finished in the autumn of 1886. By September 1887, eight production machines had been built. The original comptometer design was patented by Felt, on July 19, 1887 and on October 11, 1887. Two years later, on June 11, 1889, he was granted a patent for the Comptograph. A Comptograph is a comptometer with a printing mechanism making it more like a key-set calculating machine (even though the keys are registered as they are typed and not when a handle is pulled), therefore slower and more complicated to operate. It was the first printing-adding machine design to use individualized type impression which made its printed output very legible. The first comptograph was sold to the Merchants & Manufacturers National Bank of Pittsburgh, PA. in December 1889. It was the first sale of a machine ever. This machine is now on display at the Smithsonian Institution in Washington, D.C.. The Felt & Tarrant Manufacturing Company built both comptometers and comptographs throughout the 1890s. In 1902, the Comptograph Company was set up to manufacture comptographs exclusively, but was shut down at the beginning of World War I.  Forty years later, in the mid-1950s, the Comptometer Corporation reused the name Comptograph for a line of 10 key printing machines. The comptometer was the first machine in production to challenge the supremacy of the arithmometer and its clones; but not immediately, it took almost three years to sell the first hundred machines. Felt and Tarrant signed a partnership contract on November 28, 1887. The partnership was incorporated as Felt & Tarrant Manufacturing Company on January 25, 1889. In 1902, Felt and Tarrant parted ways in creating a second company and decided to split the shares of both companies so that one would own the controlling interest of a company with 51% of the shares and the other would still share the profits with the remaining 49% of the shares. Felt became the majority owner of the Felt & Tarrant Manufacturing Company and Mr. Tarrant became the majority owner of the Comptograph Company.