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63Y1697 - Lenovo (Motherboard) for ThinkPad T420 / T420i 63Y1697 - Lenovo (Motherboard) for ThinkPad T420 / T420i $156.40
63Y1705 - IBM Lenovo Descrete Graphics for ThinkPad T420 T420i 63Y1705 - IBM Lenovo Descrete Graphics for ThinkPad T420 T420i $162.00
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63Y1703 - Lenovo 2-Slot DDR3 RAM (Motherboard) Socket-989 for ThinkPad T420 / T420i 63Y1703 - Lenovo 2-Slot DDR3 RAM (Motherboard) Socket-989 for ThinkPad T420 / T420i $85.18