It was the fall of 1965 and Jack Kilby and Patrick Haggerty of Texas Instruments sat on a flight as Haggerty explained his idea for a calculator that could fit in the palm of a hand. This was a ...

The HP-35, so named because it had 35 keys, was Hewlett-Packard’s first pocket calculator and the world’s first calculator with trigonometric and exponential functions. It was introduced in ...