Answer: abacus

AnswerCrossword Clue
ABACUSCounting board
ABACUSCalculator that doesn't shut off
ABACUSAncestor of a calculator
ABACUSDevice you can count on
ABACUSYou can always count on this
ABACUSBeaded counter
ABACUSEarly computer
ABACUSCalculator of a kind
ABACUSCounting aid
ABACUSOld store counter
ABACUSProblem solver?
ABACUSSoroban
ABACUSManual calculator
ABACUSCrude calculator
ABACUSCalculating device
ABACUSComputer of a sort
ABACUSEarliest computer
ABACUSNon-electronic calculator
ABACUSCalculator's cousin
ABACUSAdding device of old
abacusa counting frame using beads
abacuscounting device using rows of sliding beads
ABACUSPrecalculator calculator
ABACUSSimple adding device
ABACUSSomething you can always count on
ABACUSOld calculator
ABACUSEarly summer?
ABACUSKind of calculator
ABACUSEastern computer
ABACUSCalculator of old
ABACUSBeaded device
ABACUSCalculator that doesn't need batteries
ABACUSAncestor of the adding machine
ABACUSColumn slab
ABACUSSomething you can count on
ABACUSPrimitive calculator
ABACUSAdding device
ABACUSLow-tech calculator
ABACUSCalculator of a sort
ABACUSBasic computer