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HP-15C and HP 11C programmable scientific calculator made by Hewlett-Packard - natural wood background Stock Photo - Alamy
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A Hewlett Packard HP11C calculator and a scale rule inscribed Institution of Civil Engineers London on a white background Stock Photo - Alamy
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GitHub - HadrianFinch/HP11C: A simple win32 app that emulates the HP11C calculator and uses Reverse Polish Notation
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