Crossword puzzle clue "manual calculators"

Here are the possible solutions for manual calculators clue

Answer
Clue
Relevancy
abaci
Clue
Manual calculators
Early calculators
Ancient calculators
Precalculator calculators
Beaded calculators
Primitive calculators
Old calculators
Low-tech calculators
Definition
ABACUS, (Latin) a counting frame using beads

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