On 11/09/2020 01:51, Martin Gregorie wrote:
> The HP-35, IIRC the first scientific/engineering pocket calculator to be
> available, appeared in 1972. I still have a working HP-21, its successor,
> that I bought in 1976.

And I have a linux app. :-)

--
“The fundamental cause of the trouble in the modern world today is that
the stupid are cocksure while the intelligent are full of doubt."

    - Bertrand Russell

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