• Abacus History - Invention of the Abacus
  Fascinating facts about the invention of the Abacus by the Chinese in 3000 BC.
  Fascinating facts about the invention of the Abacus by the Chinese in 3000 BC.
  abaci abacus addition babylonians calculator chinese computer greeks mathmatics orient personal positional romans subtraction
  in PM Ref with 3000 abacus chinese facts fascinating invention nbsp ref
• Abacus History - Invention of the Abacus
  Fascinating facts about the invention of the Abacus by the Chinese in 3000 BC.
  Fascinating facts about the invention of the Abacus by the Chinese in 3000 BC.
  abaci abacus addition babylonians calculator chinese computer greeks mathmatics orient personal positional romans subtraction
  in PM Ref with 3000 abacus chinese facts fascinating invention nbsp ref

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