Crossword puzzle clue "20 devices"

Here are the possible solutions for 20 devices clue

Answer
Clue
Relevancy
aaaa
Clue
Battery for small devices
abaci
Clue
Simple adding devices
Old counting devices
Counting devices
Simple counting devices
Early adding devices
Devices also called counting frames
Computing devices
Definition
ABACUS, (Latin) a counting frame using beads

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