Mine is probably an Ingersoll Rand grinder ( or " high speed sander") like this http://www.sears.com/shc/s/p_10153_...id=YAHOOSSP01&sid=ISx20070515x00001c that my dad got me when I first started doing bodywork the week after high school graduation. He found it at a yardsale for $10 and it was pretty well beat. This was i n1994 and I still have it and use it, though not as often but it stil does the job!