Quote:
Originally Posted by CurtEgerer
My 11C purchased in 1980 got me thru school, the PE exam, my entire career as a structural engineer and still in use today. I also have a 15C app (JRPN 15C) on my phone.
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My 11C died a few years back. I used it for 30 years. I probably bought it ~1985. You can get an 11C or 15C app for your phone. The App I use uses RPN.