Decimal Abacus
This wooden base abacus with measure 15cmx4cm, thickness 18mm having 7holes with 7 spikes of 4mm thick metal, provided with 7 beads of 7colors.
Decimal Abacus
This wooden base abacus with measure 15cmx4cm, thickness 18mm having 7holes with 7 spikes of 4mm thick metal, provided with 7 beads of 7colors.
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