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International Society for Clinical Densitometry (ISCD) Skeletal Health > Learn > Resources > Online Store > Product Details
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A set of Napier's bones. An early type of calculator capable of addition, subtraction, multiplication, division as well as extracting square roots. England, ~1679 AD. [1280x1232] : r/ArtefactPorn
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Napier's bones were calculator sticks invented in 1617 to multiply big numbers by a single digit : r/toolgifs
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