The Braille Abacus was designed specifically for individuals who are blind.
What makes it unique is the piece of soft fabric or rubber that is placed behind the beads so that they will not inadvertently move while the person performs calculations.
Tuesday, August 11, 2020
Braille Abacus
What makes it unique is the piece of soft fabric or rubber that is placed behind the beads so that they will not inadvertently move while the person performs calculations.
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