I've got an Enco end mill sharpener from the 80's that looks very similar. You've probably seen it before but I can send you pictures if you are interested. That general style of grinder seems to be somewhat generic and you may find several companies sold it, like Chevalier, KBC, etc. I found a manual for mine for $25 from a company called Gromax and it appears to be nearly an exact match so far as parts are concerned. Email me and I may be able to found a clone manual for you from another source. Might not be an exact match but some components should be the same as yours.
Did you get any tooling for it, like an air bearing?
11 years ago