HP 48SX Calculator from 1990 - YouTube
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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HP Calculator Pictures
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HP48sx - TheCalculatorStore
Hewlett Packard HP 48SX Scientific Expandable Calculator Works w/ Case & Manual | eBay
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HP Computer Museum
HP 48SX Drawing - detailed information
1989 Hewlett Packard HP 48SX Calculator with Case and 3 Books TESTED | eBay
HP 48SX Calculator Demonstration Card - YouTube
HP 48SX SCIENTIFIC EXPANDABLE CALCULATOR Owner's Manual Volume II: Hewlett Packard: Amazon.com: Books
HP-48S/SX
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