Early calculating devices including the abacus {invented 500 years ago in China}, Napier’s bone [a set of rods invented in 1614 for basic maths operations].
Early calculating devices including the abacus {invented 500 years ago in China}, Napier’s bone [...
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![Early calculating devices including the abacus {invented 500 years ago in China}, Napier’s bone [a set of rods invented in 1614 for basic maths operations].](https://slidepub.com/thumb/6985/269936985.jpg)
