Crossword puzzle clue "calculator's ancestor"

Here are the possible solutions for calculator's ancestor clue

Answer
Clue
Relevancy
psat
Clue
It has "calculator" and "no-calculator" math sects.
sliderule
Clue
Pre-calculator calculator
Calculator ancestor
abacus
Clue
Calculator's ancestor
Ancestor of a calculator
Definition
(Latin) a counting frame using beads
abaca
Clue
Oriental calculator
Definition
(Tagalog) a Philippine plant, also ABAKA
abaci
Clue
Y2K-compliant calculator
Calculator with no batteries
Definition
ABACUS, (Latin) a counting frame using beads

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