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Lenovo ThinkPad T420s RAM Replacement - iFixit Repair Guide
OFFTEK 4GB Replacement Memory RAM Upgrade for IBM-Lenovo ThinkPad T420s (DDR3-10600) Laptop Memory at Amazon.com
parts-quick 8GB Memory for Lenovo ThinkPad T420s DDR3 PC3-10600 1333MHz SODIMM Compatible RAM at Amazon.com
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Memory RAM Upgrade for Lenovo ThinkPad T420s 4GB DDR3 SODIMM | eBay
Lenovo ThinkPad T420s RAM Replacement - iFixit Repair Guide
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CMS 4GB (1X4GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad T420S 4170, 4171, 4173 - A30 at Amazon.com
