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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. Introduced at US$395[1], the HP-35 was available from 1972 to 1975.
Market studies at the time had shown no market for pocket sized calculators. However, HP co-founder Bill Hewlett began development of a "shirt-pocket sized HP-9100", and it turned out that the marketing studies were wrong. In the first months orders were exceeding HP's expectations as to the entire market size. 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.
On July 12, 2007, HP announced the release of the "retro" HP 35s in commemoration of the original HP-35 [2].
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