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Refurbished: HP All-in-One PC TouchSmart 520-1047 (QU052AAR#ABA) Intel Core i5 2400S (2.50GHz) 6GB DDR3 1.5TB HDD 23" Touchscreen Windows 7 Home Premium 64-Bit - Newegg.com
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HP launches TouchSmart 520, 420 and 320 all-in-one PCs: pics, specs, prices and release dates - The Verge
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HP TouchSmart 520-1020 All-in-One Desktop (2.6 GHz Intel Pentium Processor, 4GB DDR3, 500GB HDD, Windows 7 Home Premium) Black (Discontinued by Manufacturer) : Amazon.sg: Electronics
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HP TouchSmart 520 AIO All-In-One 23in 1080p Touchscreen AMD Quad Core up to 2.70GHz 6GB DDR3 4TB HDD Radeon Windows 10 *Reconditioned
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HP launches TouchSmart 520, 420 and 320 all-in-one PCs: pics, specs, prices and release dates - The Verge
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