13 Column Abacus, Soroban or an abacus is widely used in banks,businesses and at homes, Encased in a durable wood frame and suspended with rods, the top beads represent fives and bottom beads represent ones.Each column represents a decimal point giving the total of a 13 digit number and beads are counted by sliding them on the rods., Size:L 27cm x W 7.6cm x H 2cm .
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