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The calculator was invented by John Naiger. It was similar to the modern day multiplication table.
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The first mechanical calculator was made by willhelm schickard. It could add, subtract, and multiply.
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The very first fully electric calculator is introduced in England.
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The first battery powered, handheld calculator is put on the market.
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The very first scientific calculator is introduced. The Hewlet-Packard HP-35.
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Mechanical calculator production dies and prices of electrical calculators are lowered.
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The first solar power calculators are put on the market.
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Today we have calculators of all shapes and sizes with limitless functions.