Well, today I was rummaging through an old shed on the store's property looking for an old computer to butcher when I found a Hoover bag vacuum. It was way in the back in the dark, and I almost missed it. I saw the outline under a pile of old computers and I thought "what the hell is that?" I uncovered it a bit and I only knew what it was becuase I had previously seen this video (see link). It certainly is a weird looking thing. It's in really rough shape unfortunately. Someone cut the cloth bag off, the bristles are worn, and the back cover to the motor is missing (it will work without it though). I'll have to dig it out someday and see if I can get it working. I think it could be used to clean the cloth bags of bagless sanitaires and the like.