My Kodak book How To Make Good Pictures 1943 describes the Precision Enlarger as their top of the line enlarger, 2 heads one for up to the A head 6X9 the other B head for 4X5. Kodak made 3 other enlargers, the Advanced, the Auto Focus, and the Portable Miniature Enlarger. Not sure when Kodak stopped making enlargers, not listed in my Wards Photography Catalog of 1954.