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Why does the Abacus exist?

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Why does the Abacus exist?

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Dilson Abacus: This is the abacus that accompanies the Jesse Dilson book. It measures 5.5 inches by 3.5 inches, has 9 columns and is made of a soft wood (possibly white pine) and finished with a glossy transparent lacquer. The workmanship is fairly good considering the cost and volume.

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