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power supply - 3 wires on a (bipolar) DC plug - what are they for? - Electrical Engineering Stack Exchange
New Replacement Laptop AC Power Adapter for Dell Charger 19.5V 3.34A 65W 65 Watts Connector tip size 7.4mm x 5.0mm (with center pin) Part Number - 00001, 310-7251, 310-7696, 310-7697, 310-7866, 310-8363,
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Convert Dell Latitude Power Adaptor for Fujitsu Laptop - Web Sailor's personal blog