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Lenovo Thinkpad T420 Series - Notebookcheck.net External Reviews
Lenovo ThinkPad T420s Power Jack Replacement - iFixit Repair Guide
Lenovo Thinkpad T420-4236-NVU Laptop USB Port I/O Card 40GAB5809-G200 0A65198 - Notebookparts.com
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Fortysomething Geek: Adding USB 3.0 to a Thinkpad T420 with Ubuntu
Lenovo ThinkPad T420 Laptop WEBCAM - Intel Core i5 2.50ghz - 8GB DDR3 – Your EPower Solution
