US New for Lenovo T400S T410S T410 T410i T420 T420S X220 X220T T510 W510 W500 T520 W520 45N2071 45N2141 45N2211 keyboard
ThinkPad Keyboards: Classic versus Modern
Lenovo ThinkPad T420s Review | Digital Trends
Amazon.com: New Notebook Replacement Keyboard for Lenovo IBM Thinkpad T410 T420 X220 T510 T510i T520 T520i W510 W520 Series US Layout 42T3704 42T3737 5A702X MP-89US MP-07B83US-387 Black X220 : Electronics
LENOVO ThinkPad T420S Keyboard, Compatible with LENOVO ThinkPad T420S Keyboard