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I have a Lenovo Thinkpad T420. I just Noticed a icon and switch and the side of my Laptop. What is that? : r/thinkpad
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Docking Station IBM Lenovo ThinkPad USB 3.0 T410 T420 T420S L520 L530 T400s DOC3 | eBay
Dock Port Replicator For Lenovo T410 T420 T430s T520 X220 X2304337 3.0 Docking Station With 2key Refurbished - Cases - AliExpress