Events
First Mechanical CalculatorStart period of the development of commercially successful mechanical calculators 1872The first electronic desktop calculators 1961Start if development of handheld calculators 1965First battery powered, handheld, electronic calculator 1969First calculator to use a microprocesser 1971First solar powered and first credit card sized calculators 1978Periods
Steady development of mechanical calculators -size reduction, electronic motor drive, and other added features 1900-1975
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