James Thomson on Twitter: "My original Casio fx-451M calculator that inspired me to make PCalc. Over thirty years old, and still working! https://t.co/FosQ0F7aiw" / Twitter
![My HP 15c scientific calculator. I got it as a birthday present from my dad back in 1983 when I turned 16. It helped me through high school, was there when I My HP 15c scientific calculator. I got it as a birthday present from my dad back in 1983 when I turned 16. It helped me through high school, was there when I](https://preview.redd.it/3ig66ejwa1291.jpg?auto=webp&s=ea79ae3a4450770b6a890b869c634371bd43adc7)
My HP 15c scientific calculator. I got it as a birthday present from my dad back in 1983 when I turned 16. It helped me through high school, was there when I
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Amazon.com : Hewlet Packard Hp 15C Program [Original Version.Made In Usa ] Advanced Scientific Calculator : Office Products
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HP-15C Hewlett-Packard rpn scientific calculator and manual on a natural wood table top background Stock Photo - Alamy
Which calculator do you use, including multiple calculators if you use many of them? Pictures would be appreciated. - Quora
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