Lenovo ThinkPad 310D Reference Manual page 48

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Lenovo ThinkPad T520 Lenovo ThinkPad T520
ThinkPad Mini Dock Plus Series 3 - 90W
ThinkPad Battery 27++ (9-cell, slice)
433810U
57Y4545
ThinkPad triple external monitor confi guration Lenovo ThinkPad T520
using NVIDIA's Optimus technology