Crossword puzzle clue "calculating machines of old"

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Answer
Clue
Relevancy
abaci
Clue
Calculating machines of old
Calculating instruments
Definition
ABACUS, (Latin) a counting frame using beads
quipu
Clue
Old Peruvian calculating device
Definition
(Quechua) a device of knotted cords, used by Incas of Peru to calculate or order information, also QUIPO, QUIPPU
sliderule
Clue
Old math calculating tool
Old calculating device
abacus
Clue
Calculating device
Simple calculating device
Chinese calculating frame
Definition
(Latin) a counting frame using beads

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