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The Abacus, also called a counting frame, is a calculating tool that has been in use since ancient times.

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A Ruler with a sliding central strip, marked with logarithmic scales and used for making rapid calculations, especially multiplication and division.

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Demonstration of Slide Rule Multiplication

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The Jacquard machine is a device fitted to a loom that simplifies the process of manufacturing textiles with such complex patterns.

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How an 1803 Jacquard Loom Led to Computer Technology

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Charles Babbage was a mathematician, philosopher, inventor and mechanical engineer, Babbage originated the concept of a digital programmable computer.

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The period of first generation was from 1946-1959. The computers of first generation used vacuum tubes as the basic components for memory and circuitry for CPU.

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On September 9, 1947, the world's first computer bug was recorded. But this was no ordinary 'software bug'. It was a real-life moth that was causing the issues with the computer's hardware. This “first actual case of bug being found" was recorded by computer scientist Grace Hopper.