Hardware Design of the HP 48SX Scientific Expandable Calculator
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Hewlett-Packard HP 48SX Scientific Expandable Handheld Electronic Calculator | National Museum of American History
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HP 48SX scientific expandable (1989) - Hewlett-Packard - LastDodo
File:Hewlett Packard Model HP 48SX Scientific Expandable Electronic Pocket Calculator, Made In Singapore, Available 1990 - 1993 (21761270898).jpg - Wikimedia Commons
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HP48SX Owner Manual Vol 1 | PDF | Hewlett Packard | Computing And Information Technology