Crossword puzzle clue "primitive adders"

Here are the possible solutions for primitive adders clue

Answer
Clue
Relevancy
abaci
Clue
Primitive adders
Old adders
Adders
Adders with beads
Early adders
Eastern adders?
Beaded adders?
Ancient adders
Definition
ABACUS, (Latin) a counting frame using beads

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