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The abacus was originally used to add and subtract. It was much faster than an adding machine. Its weakness was that it did not leave a paper trail.
The Chinese abacus
Abacus was invented by the Chinesethe abacus was also known as the first computer
A brain - and it is not a simple device. It was assisted by an abacus, but without a brain an abacus would not have been much use!
the abacus is made by the Egyptian in Egypt.