Actually the first is a drill sharpening rig for an old type of drill sharpener that I believe sunstrandt made back in the day. I used that exact same thing to hold and index drills in it at one of the first machine shops I worked at. It was also useable in a tool grinder that they made for sharpening end mills. I don't see any bolt slots or toe clamp surfaces acceptable for clamping that to a mill table, do you?
The one on the right, no clue.