16GB KIT (2 x 8GB) for IBM Lenovo ThinkPad T Series T420 T420i T420s T520 T520i. SO-DIMM DDR3 Non-ECC PC3-10600 1333MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com
4GB Upgrade for a Lenovo ThinkPad T420 System (DDR3 PC3-12800, Non-ECC, ) at Amazon.com
Amazon.com: Lenovo Thinkpad T420 - Intel Core i5 2520M 8GB 320GB Windows 10 Professional (Renewed) : Electronics
Amazon.com: CMS 128GB mSATA 6GB/s Internal SSD Compatible with Lenovo ThinkPad T420 Series - C29 : Electronics
Amazon.com: Lenovo ThinkPad T420 Business Laptop - Windows 7 Pro - Intel Core i5-2520, 512GB SSD, 16GB RAM, 14.0" HD (1366x768) Anti-Glare Display, ThinkLight Keyboard Light, DVD/CD-RW Drive, VGA : Electronics
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Amazon.com: SUNMALL T410 Keyboard, New Laptop Keyboard with Pointer for Lenovo ThinkPad t410 t420 t510 t520 x220 t400 t420s US Layout Black : Electronics
A-Tech 4GB Module for Lenovo ThinkPad T420 Laptop & Notebook Compatible DDR3/DDR3L PC3-14900 1866Mhz Memory Ram (ATMS350677B13039X1) at Amazon.com