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HP ProOne 400 G1 21.5 All-In-One i3-4360T 3.2GHz 4GB 500GB [K1K35UT] - $819.99 : Professional Multi Monitor Workstations, Graphics Card Experts
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HP - ProOne 400 G3 20" Touch AIO - Intel Core i3-7100T (3.40 GHz) - 4GB RAM - 500GB HDD - Windows 10 Pro - PCSP
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Specs HP ProOne 400 G1 Intel® Core™ i3 54.6 cm (21.5") Touchscreen 4 GB DDR3-SDRAM 500 GB HDD All-in-One PC Windows 8.1 Pro Black All-in-One PCs/Workstations (F4Q61EA)
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HP All-in-One PC ProOne 400 G1 (F4J79UT#ABA) Intel Core i3 4330T (3.00GHz) 4GB DDR3 500GB HDD 19.5" Windows 7 Professional 64-bit (available through downgrade rights from Windows 8.1 Pro) - Newegg.com
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