50 years ago, the legacy of the homegrown Comptometer ended in Chicago. Developed by Dorr Eugene Felt using a macaroni box in 1885, the Comptometer became the first commercially-successful key-driven adding machine. Relics of its reign still exist: the original prototype at the Smithsonian, the main factory building at the 1700 N. block of Paulina (now lofts), and this nose-poke threatening ad from 1942.