Rare red double abacus soroban 42 digits vintagesherman.
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It is now certain that soroban teaching helps children to develop an active approach to learning and greatly increased their powers of mental calculation.
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Only one owner non smoker.
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5 out of 5 stars.
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It seems to be not suitable for calculating but mainly as a wall decoration.
Soroban is the name given to the traditional japanese abacus or calculating frame which is increasingly being seen as a valuable mathematical tool for a technological age.
23 38 shipping.
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139 61 21 30 postage.
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