Hp 17bii Financial Calculator
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HP-35 - The HP-35 was Hewlett-Packard's first pocket calculator and the world's first scientific pocket calculator (a calculator with trigonometric and exponential functions). Like some of HP's desktop calculators it used reverse Polish notation.
HP-18C - The HP-18C was a Hewlett-Packard business calculator which was quickly followed by the very similar but greatly improved HP-19B. The HP-18C was HP's first RPL-based calculator although programming was not allowed to the user.
HP-41 extension module - HP-41 extension (or expansion) modules allowed the user of a HP-41 programmable calculator to extend the functionality of the machine. The HP-41 had room for up to four expansion modules at the back of calculator.
HP-10B - The HP-10B is a student business calculator. The older model of this calculator proved to compete well with the higher end RPN HP-12c.
