calculators\Hewlett-Packard HP 28C - calculator.org
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File:HP logo on front of HP-28S calculator (24467495100).jpg - Wikimedia Commons
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Hewlett-Packard HP-28C Handheld Electronic Calculator | National Museum of American History
My HP 28S is about to die. Does anyone know of a programmable calculator on the market today with similar functionality? I have a lot of little “programs” that I use for
HP-28S Advanced Scientific Calculator (Part 1) - YouTube
HP-28S Advanced Scientific Calculator
HP-28C/S
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HP-28S Advanced Scientific Calculator
ThrowbackThursday – My old HP calculators – TexasSwede
HP 28S Scientific Calculator for sale online | eBay
The HP 28S programmable calculator
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100% UNTESTED* VINTAGE HP 28S HEWLETT PACKARD ADVANCED SCIENTIFIC CALCULATOR | eBay
HP 28S
Hewlett-Packard HP-28C Handheld Electronic Calculator | National Museum of American History
HP-35 - Wikipedia
