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Blaise Pascal started to develop a mechanical calculator - the Pascaline. Capable of addition, subtraction was performed by nines-complement addition, and multiplication was performed by repeated additions and subtractions. It had shortcomings and failed to sell.
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W.T. Odhner in Sweden independently develops the pin-wheel calculator. Since then, many calculating machines have used the same principle.
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Dorr E. Felt invents the Comptometer, the first succesfull key-driven adding and calculating machine. In 1886 he joined with Robert Tarrant to form the Felt & Tarrant Manufacturing Company which went on to make thousands.
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miniature hand-held mechanical calculator introduced. One of the few major innovations in mechanical calculators in the mid 20th century.
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First battery powered, hand-held, electronic calculator. First calculator using just LSI (Large Scale Integration) chips.
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The first solar powered calculators were introduced, the Royal Solar 1. First solar-powered and first credit card sized calculators
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The Sharp PC1211 / Tandy TRS80 PC-1 is the first hand-held computer; it has a QWERTY keypad and runs the BASIC language.
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Casio made the first graphing calculator, the fx-7000G.
