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My dad bought me this HP 48SX in 1992. Still works perfectly and I still use it : r/BuyItForLife
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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
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Hewlett Packard HP 48SX Scientific Expandable Calculator Case Manual FOR REPAIR | eBay
HP 48SX Calculator Demonstration Card - YouTube
Hewlett Packard 48SX Graphing Calculator : r/BuyItForLife
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HP 48SX Calculator from 1990 - YouTube
1989 Hewlett Packard HP 48SX Calculator with Case and Guide - Tested | eBay
Hewlett Packard 48GX Repair - iFixit
HP48sx - TheCalculatorStore
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