Crossword puzzle clue "early calculators"

Here are the possible solutions for early calculators clue

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

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