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Amazon.com: Dell Latitude E6420 14.1-Inch Laptop (Intel Core i5 2.5GHz with 3.2G Turbo Frequency, 4G RAM, 128G SSD, Windows 10 Professional 64-bit) (Renewed) : Electronics
Amazon.com: Dell Latitude E6420 14.1in HD Business Laptop Computer, Intel Quad-Core I7-2760QM up to 3.5GHz, 8GB RAM, 128GB SSD, DVD, HDMI, Windows 10 Professional (Renewed) : Electronics
Dell Latitude E6420 RAM Replacement - iFixit Repair Guide
Dell Latitude E6420 Business Class Laptop Intel i7 2620M 2.70GHz Processor 8GB RAM Memory 500GB Hard Drive DVDRW Windows 7 Professional 64-bit Integrated Web Camera - Walmart.com