The HP-35 reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

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 RPN. 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 and it turned out that the marketing studies were wrong. In the first months orders were exceeding expectations by far.

This is the "HP-35" reference article from the English Wikipedia. All text is available under the terms of the GNU Free Documentation License. See also our Disclaimer.