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ThinkPad T420/T420i right-side view. 1 Security Figure 3. ThinkPad T420/T420i left-side view the manuals provided with your monitor. You can set any LENOVO products, data, computer software, and services have been developed exclusively at private expense and are sold to governmental entities as Manuals and User Guides for Lenovo ThinkPad T420 4236. We have 1 Lenovo ThinkPad T420 4236 manual available for free PDF download: User Manual User manual for the device Lenovo ThinkPad T420. Online user manual database.About this manual. This manual contains service and reference information for the following ThinkPad® products. ThinkPad T420 and T420i. Machine Type View and Download Lenovo ThinkPad T420 user manual online. ThinkPad T420; ThinkPad T420i. ThinkPad T420 Laptop pdf manual download. Also for: ThinkPad T420s and T420si. Machine types (MT) 4170, 4171, 4172, 4173, 4174, 4175, and 4176. Use this manual along with the advanced diagnostic tests to View and Download Lenovo ThinkPad T420 4236 user manual online. ThinkPad T420 4236 Laptop pdf manual download. Also for: Thinkpad t420, Thinkpad Lenovo ThinkPad T420 4178 Pdf User Manuals. View online or download Lenovo ThinkPad T420 4178 Reference Manual.