Slash ("/") in Thinkpad T420 ABNT keyboard - Ask Ubuntu
C9-use For Lenovo Thinkpad T420 T420i T420s Laptop Keyboard Us English Eua Fru 04w2753 45n2071 45n2141 45n2211 100% Test Ok - Replacement Keyboards - AliExpress
How to remove keyboard from Lenovo ThinkPad T420s - YouTube
How to remove keyboard from Lenovo ThinkPad T420s – Inside my laptop