Here's the American version, made by Hubbell. As far as I can find out, these were an earlier version of our modern 3 prong outlet for 120V 15A. The one here in this picture has 240V to feed an European vacuum tube AM and SW radio. And it's rated for 240V as well as 120V, and has an old UL seal of approval too. The radio doesn't mind it being 60Hz vs its home 50Hz. :-) [Linked Image from geocities.com]