a caculator
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abacus and a calculater
The electronic calculator.
The calculator is the modern invention that replaced the abacus. Calculators are electronic devices that can perform mathematical calculations quickly and accurately, making them more efficient and user-friendly than traditional abacuses.
The invention of the transistor - and the later invention of the integrated circuit, which uses transistors - made it possible to have thousands, and eventually millions and billions of components on an area of a few square centimeters, making it possible to produce complicated circuits, and thus build lots of electronic devices, including modern computers.