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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
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Casio Fx-82es Fx82es Plus Bk Display Scientific Calculations Calculator with 252 Functions - Walmart.com
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Amazon.com: Casio Fx-82es Fx82es Plus Bk Display Scientific Calculations Calculator with 252 Functions : Office Products
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