WMechanical calculator
WAddiator
WAdding machine
WAnalytical Engine
WAntikythera mechanism
WArithmaurel
WArithmometer
WAstrolabe
WFrank Stephen Baldwin
WComptometer
WCurta
WDifference engine
WDorr Felt
WThomas Fowler (inventor)
WCurt Herzstark
WJeton
WLeibniz wheel
WMercedes-Euklid
WMinoan Moulds of Palaikastro
WNapier's bones
WOdhner Arithmometer
WWillgodt Theophil Odhner
WOrganum Mathematicum
WPascal's calculator
WPinwheel calculator
WRectangulus
WDifference engine
WWilhelm Schickard
WSlide rule
WStepped reckoner
WTabulating machine
WThe Millionaire (calculator)
WTide-Predicting Machine No. 2