Casio Scientific Calculator Watch - Sports Pocket Watch.
HP 32S Scientific Calculator
file: 860x1290-HP32Scalculator0847x1210 The HP-32S was a simple Reverse Polish Notation (RPN) calculator, originally code-named "Leonardo." (RPN is a system for representing mathematical expressions without the use of parentheses.) Due to the broad range of functions, coupled with the $70 introduction price, the HP-32S was a popular calculator for science and engineering students.HP-34C Scientific Calculator
HP-34C scientific programmable calculator, manufactured from 1979 to 1983. It was the first Hewlett Packard pocket calculator to offer root finding and numerical integration.
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