(1800) Allesandro Volta he invented Voltaic Battery - the first electric battery

(1893) Otto Shweiger he invented Millionaire - the first efficient four function calculator.

(1906) Lee De Forest he invented Vacuum tube - it provides electrically controlled switch, a necessity for digital electronic computers.
(1832 - 1835) Samuel F. B. Morse he invented Telegraphs - practical system.

(1853) Pehr and Edvard Scheuts they invented Tabulating machine - capable of processing 15 digits numbers, printing out results and rounding off to 8 digits.

(1855) Dorr Felt he invented Comptometer - key-driven adding and subtracting calculator.

(1889) Dorr Felt he invented Felt's Comptograph - containing a built-in printer is introduced.

(1890) Herman Hollerith (the father of information processing) he invented punched cards - specifically for census taking.

(1890) Herman Hollerith he invented Founder: Tabulating Machine Company . Known today as International Business Machines, Corp. (IBM).