There is an assortment of similar items, the main one looks like a fence fo r a milling machine. The broken knob goes to this "fence". There was th is machine (lower pic) next to the jointer, looks like some sort of milling machine - https://www.flickr.com/photos/43836144@N04/46720690445/in/datep osted-public/
I suspect my extra parts are for this "milling(?)" machine. Can someone po ssibly ID these parts, ID them for the milling machine and/or ID this machi ne as a milling machine. Scroll right on the above link for 7 more (parts ) pics.
If I can verify that this "fence", etal, belongs to the "milling" machine, I'll contact the auction folks and try to get these parts to the rightful o wner.