I am familiar with that site, thanks. Yes, the site belongs to an instructor at Cal State University at Northridge, just South of where I live. I have a lot of what is posted on his site, and the majority of what I have I don't see posted on his site. I have been scanning my 40 year collection of catalogs and would like to turn it into a large encyclopedia for research depicting the progression of instrument making over the years. I have, at the latest count, made 2,919 scans of material. I still have quite a ways to go. I have uploaded a few more Unitron images to my personal photo page here on Astrovox, if interested. -Fred