Vtg Casio FX-4000P Scientific Calculator Works New Batteries - Loose Faceplate | eBay
MyCalcDB : Calculator Casio fx-4000P
MyCalcDB : Calculator Casio fx-4000P
Lot Of 5 Vintage Calculators Casio Texas Instrument Hewlett Packard | eBay
Guy Leech on Twitter: "It lives! This @Casio fx-4000P programmable calculator was bought for me by my late Dad's company as payment for writing some software (in compiled BASIC) for them whilst