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2500 BCE
Abacus
A tool used for calculating numbers -
Stepp Reckoner/Leibniz wheel
Gear operated wheel mechanical calculator
Gottfried Leibniz -
Difference Engine
Mechanical computer whose function was based off polynomials - commonly used in engineering and navigation. -
Analytical Engine
the first real computer. Fully program controlled Automatic and digital computer.
Charles Babbage -
Tubulating Machine
Machine designed to summarize data stored on punch cards. This aided in quickly completing the 1890 census.
Herman Hollerith