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File:Hewlett Packard Model HP 48SX Scientific Expandable Electronic Pocket Calculator, Made In Singapore, Available 1990 - 1993 (21761270898).jpg - Wikimedia Commons
Hewlett Packard HP 48SX Scientific Expandable Calculator Works w/ Case & Manual | eBay
HP-48S/SX
1989 Hewlett Packard HP 48SX Calculator with Case and Guide - Tested | eBay
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