HP15C RPN Scientific Calculator
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First released in 1981 and discontinued in 1989, the HP-10C was part of the "10C series" that also featured the still available 12C. A limited edition of 1,000 units was released in 2011. I acquired mine during my college years in 1987 and it's still going strong. As an added bonus, I have the 15C app on my iPhone too. For more information, check out (http://en.wikipedia.org/wiki/HP-10C_series) and (http://www.hpmuseum.org/hp15.htm). You can also view two photos of a real HP-10C in this text.
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