Crossword clues for Old calculators 5 letters:ABACIVery old calculatorsABACIOld calculatorsABACICalculators, old style.ABACICalculators of oldQUIPUOld Peruvian calculating deviceABACIOld-style calculatorsABACICalculating machines, of oldSLIDERULEOld calculatorABACUSOld calculatorABACUSCalculator of oldSLIDERULEOld math calculating tool