I acquired this Pow-R-Vac today. Model 2020 and made by Walton Products Inc. It's dirty and has some rust but does work. I did find the trademark information. Registered in 1970, expired in 1992 and first used in 1968. I really haven't been able to find anything else online and probably will sell it if it's worth anything, maybe put it on ebay. I know there are vacuum collectors out there. Thought I'd post up some pix and see if the ORDN brain trust had any info?