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HP-27S
HP-27S
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HP-27S
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HP-27S Owner's Manual - HP Calculator Literature
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File:HP 27S Scientific calculator, front, power on, end of keyboard test, on blue background (30268535976).png - Wikimedia Commons
Step-by-Step Solutions: Technical Applications (27S/19B)
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HP ENVY 27s 27-inch Display
MyCalcDB : Calculator Hewlett-Packard 27S aka Pioneer MENTOR
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Manual for Hewlett Packard HP 27S Calculator | eBay
