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Finally: an USB plug you can insert either side up. - http://www.yankodesign.com/2011/01/25/this-usb-plugs-in-both-...
it is still negligible to barrel connector, if it ever to land in USB ‎· silpol
I wonder if a barrel connector can handle USB2 speeds, let alone USB3. self-centering ability is nice, though; regular USB connectors could implement a bit of it. ‎· 9000