Casio FX82 calculator I bought in 1982 at the age of 15. Used it throughout school, my apprenticeship and work as a draughtsman. Don't use it much now but it still works
www.casio-calculator.com Casio 001
Casio FX-82LB
How do you remove the batteries from the Casio FX 82 LB : r/calculators
Casio FX-82LB Fraction Taschenrechner | Kaufen auf Ricardo
Casio FX-82LB Fraction - Calculator - Computing History