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19.5V 3.34A, Barrel 7.4/5.0mm With Pin, 3-Prong Fl F7970, 5U092, T2357, FF171, N2765, ADP-65JB B Dell Common Item (Dell) AC Adapter- Laptop. PcHub.com - Laptop parts , Laptop spares , Server parts
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power supply - 3 wires on a (bipolar) DC plug - what are they for? - Electrical Engineering Stack Exchange
How does a Dell laptop charger with a pin of the same wattage & specs which fits perfectly into an HP not work because it knows it is not an HP charger
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