The HP-35

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Launched in 1972 by Hewlett-Packard, the HP-35 was the first pocket calculator with scientific functions that could replace a slide rule. The $395 HP-35 used reverse Polish notation (RPN), also called postfix notation. A calculation like “2 plus 7” is, using RPN, performed by pressing “2”, “Enter↑”, “7”, and “+”; instead of the algebraic infix notation: “2”, “+”, “7”, “=”.

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