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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HP-15C and HP 11C programmable scientific calculator made by Hewlett-Packard - hand held electronic device Stock Photo - Alamy
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Amazon.com: Hewlet Packard Hp 15C Program [Versión original.Made in USA ] Calculadora científica avanzada : Productos de Oficina
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Topic: My old HP 15C calculator is a technical wonder. @ AskWoody