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
How do you remove the batteries from the Casio FX 82 LB : r/calculators
CALCULADORA CASIO FX-82LB de segunda mano por 10 EUR en Valencia en WALLAPOP
calculafora casio fx-82lb - Comprar Artigos de Eletrónica em Segunda Mão no todocoleccion
Casio FX-82LB Fraction Scientific Calculator With Cover Fully Working Vintage | eBay