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File:Casio fx-991MS.jpg - Wikimedia Commons
Casio Makes Scientific Calculator Web Service and Learning Tools Free of Charge to Support Math Study during School Closures
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 to calculate complex exponential in Scientific Calculator ( Casio fx 991ES PLUS ) - YouTube
How to Use a Scientific Calculator - Science Struck