Reverse Polish Notation (AKA Postfix Notation) Calculator for Windows 7 - Software Recommendations Stack Exchange
File:Vintage Hewlett-Packard Model HP-16C Progammable RPN Calculator, HP's First and Only Programmable Calculator, Circa 1988 (9330369298).jpg - Wikimedia Commons
How to Use Reverse Polish Notation on a Calculator : 10 Steps (with Pictures) - Instructables
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An Open-source Scientific RPN Calculator | Hackaday
RPN Calculator Alternative to HP | Lamentations on Chemistry