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AC Adapter Charger For Lenovo ThinkPad W541 45N0501 ADL135NLC2A 135W 20V 6.75A - Newegg.com
CDS Parts - 170W Slim Tip Ac Adapter Charger & Cord for Lenovo ThinkPad W540 W550
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Laptop AC Adapter 20V 8.5A 170W Square tip ADP-170CB B SA10J20113 54Y8975 Power Charger Compatible with THINKPAD W541 THINKPAD T440P THINKPAD W540 Notebook Power Supply - Newegg.com