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A: Palo Alto, California, United States

Hewlett-Packard Introduces the HP-35, the First Handheld Scientific Calculator

First production run of the HP-35

The first production of the HP0-35 run had a small red dot to the right of the on/off switch that would show when the calculator was turned on and did not have the "35" designation on the label.

In 1972 Hewlett-Packard, Palo Alto, California, introduced the HP-35, their first pocket calculator, and the first pocket scientific calculator with trigonometric and exponential functions. The unit, which fit in a shirt pocket, was priced $395.

"Before the HP-35, the only practical portable devices for performing trigonometric and exponential functions were slide rules. Existing pocket calculators at the time were only four-function, i.e., they could only do addition, subtraction, multiplication, and division. It had been originally known simply as 'The Calculator', but Hewlett suggested that it be called the HP-35 because it had 35 keys" (Wikipedia article on HP-35, accessed 03-10-2012).

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