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The earliest form of calculator is called an abacus. These were used for calculating in many ancient societies. The earliest record of a device used to calculate numbers was a Sumerian abacus (2700-2300 BC); records of the Persian Empire using a form of abacus (600 BC); records of a Greek abacus (300 BC), Chinese abacus (200 BC), and Roman use of a form of abacus (100 BC) all predate the life of Leonardo da vinci.

These early abaci were usually a frame of wood or bamboo, with pebbles, beads, or beans moved on a wire, rod, or string, or moved along a groove. Over the centuries, many devices have been used to calculate numbers. The closest forerunner to the modern calculator would be the encrypting devices used in World War 2.

Leonardo da Vinci (1452-1519) was a very prolific inventor and drew plans for many types of devices. There is only one drawing attributed to da Vinci of a more complex 'calculating' device for which no date is given. See the link below for a little 'history' of this drawing.

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