HP 42S
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DM42
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HP-42S
HP-42S Scientific Calculator with Case | eBay
Hp 42s Calculator Repair & Upgrade - Keyboard repair & 32kb Memory Ram Upgrade - YouTube
DM42 - The Most Precise Calculator. : Amazon.ca: Office Products
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HP 42S RPN Scientific Calculator, 電腦＆科技, 手提電腦- Carousell
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HP-42S Owner's Manual - HP Calculator Literature
HP-42S - Wikipedia
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