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I had a scientific calculator that I bought around 1980. I still used it regularly up until my youngest niece LG threw it in the toilet around 1999. Surprisingly, today's most of today's scientific calculators are not much more advanced.
(This wasn't one of the programmable ones. They were way too expensive back then.)
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@lnxw48a1 I used to have a HP 41CV I used for work that I got in the mid 80's and it lasted until about 6 or so years ago, it got replaced with a HP 35s that I still use.