Hewlett-Packard HP 35 (Classic)
The Hewlett-Packard HP 35 is a scientific calculator with 12 digits precision and RPN (reverse polish notation) logic. It has 26 functions, 35 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is 3xAA. The calculator was manufactured in USA. Note: Prototype - never went into production.
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