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HP-28S Advanced Scientific Calculator
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Hewlett-Packard HP-28S Handheld Electronic Calculator | National Museum of American History
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Hewlett-Packard HP-28C Handheld Electronic Calculator | National Museum of American History
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HP Hewlett Packard 28S Advanced Scientific Calculator Tested & Working | eBay
HP Hewlett Packard 28S Advanced Scientific Calculator Tested & Working | eBay
HP Hewlett Packard 28S Advanced Scientific Calculator Tested & Working | eBay
