The North American Rockwell tag was an inventory asset tag. North American was the Aircraft manufacturing arm of Rockwell. They produced the T-6 Texan, T-28, The P-51 Mustang, F-86 Saber, F-100 Super Saber, A-5 vigilante, Ov-10 Bronco, and the one I worked on for them, The B-1B bomber. There were North American plants in Columbus, Ohio, Tulsa OK, and a couple in California at Palmdale and Downey. They also built the Apollo Comand/service module and the second stage of the Saturn 5. That sander could have come from any of those places. You have a piece there that was a part of a great aerospace company with a very large impact on this country. They were sold to Boeing in 1996.
Being a person who needs an hour and a couple of band-aids to get the shrink wrap off of a CD, I'm amazed at your work with this machinery. I understand absolutely nothing about what you're doing, and yet I'm fascinated by it. Looking forward to more pix and the conclusion of this most interesting thread.