These are from where I work. I have no idea what to make of the first one. It looks like you could plug in a 1-15 or a 2-15 plug, and that the two are perpindicular to each other. Maybe it's some old 3-phase thing instead? [Linked Image from img144.exs.cx]

The other one is odd both for the outlet and the cover. There are several of these scattered about the building. The building was put up sometime in the 1920s, I think. None of these outlets are actually used. I'm not sure what to make of the outlet itself. Is the center hole a ground of some kind, or just a rivet to keep the front plate on? Also, what kind of plug would need T terminals on both sides?