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Invented in 500 B.C. Used in China around 1300 A.D.
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William Schickard first invented the mechanical calculator that was unknown for 300 years
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In 1632, the circular and rectangular slide rule was invented by W. Oughtred (1574-1660).
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Blaise Pascal invented one the first calculators to help his father with taxes. Modification of Schickards design.
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Charles Xavier Thomas's invented the arithmometer
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William Seward Burroughs. Invented The Burroughs Adding Machine Company, founded in St. Louis, Missouri.
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Millionaire calculator introduced and invented by Leon Bollee,
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Miniature hand-held mechanical calculator introduced. Invented by Curt Herzstark
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Electronic handheld calculator invented by Texas Instruments.
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first solar powered calculators invented by Teal Industries Incorporated, also known as Sharp.
