This document lists important people and inventions in the history of computing from ancient times to the 1950s. It includes the Abacus, Napier Bones, the Pascaline adding machine, the Difference Engine, the Analytical Engine, tabulating machines, the Mark I calculator, the Atanasoff-Berry Computer, concepts of stored-program computing, ENIAC, the UNIVAC I, and early transistor computers like the IBM 704 that increased computational speeds. Many of these inventions and innovators were crucial stepping stones toward modern electronic digital computers.