who invented abacus
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1
Answer:
China invented abacus
Answered by
1
Answer:
Tim Cranmer
Explanation:
- An adapted abacus, invented by Tim Cranmer, called a Cranmer abacus is still commonly used by individuals who are blind. A piece of soft fabric or rubber is placed behind the beads so that they do not move inadvertently. This keeps the beads in place while the users feel or manipulate
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