Thanks Ed. The power supply was mounted above this ksu on the wall. I'll see if I can snap a photo and post it.

Most of the stuff here is/was WE, but in the early 1980's there was some ITT equipment installed. The cover is long gone, but as I recall they power supply doesn't have any manufacturer markings on it either.

As you can see from this photo they pretty much use the "abandon in place" method for any of the old or decommissioned telecom equipment. There are very few people left here who know what this stuff is, so they just leave it alone.