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HP ProBook 4540S 15.6" Standard USED Laptop - Intel Core i3 3110M 3rd Gen 2.4 GHz 6GB SODIMM DDR3 SATA 2.5" 320GB HDD DVD-RW Windows 10 Home 64-Bit - Walmart.com
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HP ProBook 4540s Intel Core i7-3632QM 2.2GHz 15.6" Windows 7 Professional 64-bit Notebook - Newegg.com
HP Laptop ProBook Intel Core i5 2nd Gen 2450M (2.50GHz) 4GB Memory 500GB HDD 15.6" Windows 7 Professional 4540s (D3J71U8#ABA) - Newegg.com
HP ProBook 4540s 15.6" Laptop Notebook Intel Core i3-2370M 2.1GHz 4GB 500GB HDMI and WIFI