On this day in 1887 the comptometer, the first commercially successful key-driven mechanical calculator, was patented in the United States by inventor Dorr E. Felt. The comptometer was primarily an adding machine, but it could also subtract by nines-complement arithmetic, divide as well as multiply through repeated addition. The comptometer had a keyboard of eight…
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packfilemanager is a manager for Total War pack files and an invaluable tool for Total War Modding. Give it a try: https://t.co/YG80HvTyMM
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