Clue: Ancestor of the adding machine

We have 1 answer for the crossword clue Ancestor of the adding machine.

Possible Answers:

• ABACUS

Related Clues:

• "Can I count on you, ___?"
• Ancient computer
• Arithmetic device
• Calculating machine
• Calculator
• Calculator precursor
• Count on it
• Early calculator
• Early summer?
• Item with beads
• Manual calculator
• Old adder
• Rice or Archer
• Something you can still count on

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