A calculator (can't remember the brand) from ~1980 that I keep in my garage. Still has the original battery! I have to hold the back on when I use it but it still works great. It's at the point now where I think there's no way it can still be giving the right answer so I'll do the calcs by hand and on another calculator and it'll be bang on. I waste a lot of time re-calculating instead of just trusting it...
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Long time caller, first time listener
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