1972

 
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The HP-35 was Hewlett-Packard's first pocket calculator and the world's first scientificpocket calculator[1] (a calculator with trigonometric and exponential functions). Like some of HP's desktop calculators, it used reverse Polish notation. Introduced at US$395,[2] the HP-35 was available from 1972 to 1975.

 
 
 
The HP-35 was Hewlett-Packard's first pocket calculator and the world's first scientificpocket calculator[1] (a calculator with trigonometric and exponential functions). Like some of HP's desktop calculators, it used reverse Polish notation. Introduced at US$395,[2] the HP-35 was available from 1972 to 1975.
 
 
 
Uruguayan Air Force Flight 571, also known as the Andes flight disaster and, in