I think it is the same, or very similar to, a model 48.
I learned on a model 48 and it was ancient in the mid sixties. Not accurate and down right dangerous. Items to be "resurfaced" are hand fed into the abrasive wheel which is adjusted to set just above the table..
I may be wrong on the model no. Here is a guy that has manuals and flyers on the machine.. Peterson Surface Grinder Manual Vibra Motive Model 48 | eBay
Tho I would pass. I can do a better job with a snag/cup grinder. I never liked the hand fed machines with a horizontal UP facing stone.