I know this is an old post but I see you have not received an answer yet.
I am familiar with the Shop Task/ Shop Master line but not the Eldorado name. This page from the Internet Archive shows all their past models (the page on their current website is not working):
http://web.archive.org/web/20130401055700/http://shopmasterusa.com/history/
(CNCZone is not letting me post a link so you'll have to copy and paste if you want to see it, sorry...)
Mine is the 12-22 TC