Kodak Enlarging Lenses
In the period from the mid-1930s through the mid-1950s, Kodak developed and manufactured enlarging lenses in quality levels parallel to those in still camera lenses. The 1939 Kodak Lenses and Shutters booklet mentions that Kodak manufactures enlarging lenses but goes no further. I have early (in this context) Projection Anastigmats, but they carry no serial number so I am assuming that there is no way to date these lenses. The first documentation I can find for individual enlarging lenses is in the first edition in 1940 of the Kodak Reference Handbook, linked below. The 1945 version of the Handbook has minor updates to this list. The 1946 Kodak Data Book: Lenses, Shutters and Portra Lenses includes the same list, though the general section of this book discusses Lumenizing, so Kodak enlarging lenses made before 1948 may have been hardcoated and it is possible that early Projection Ektars were calcium fluroide coated in the early 1940s. An EY Projection Ektar doesn't appear to be coated, but calcium fluroide coating may not impart the characteristic multi-colored refection that we are used to in later hardcoated lenses. An ER Projection Ektar looks to be coated. The 1948 Kodak Data Book: Lenses, Shutters and Portra Lenses shows the conversion from Projection Anastigmats to Projection Ektanons and a significantly reduced list of enlarging lenses that corresponded to the simplified product line of Kodak enlargers. The first detailed entries that I can find of enlarging lenses is in the 1954 Kodak Data Book: Enlarging with Kodak Materials and Equipment.

Because of Kodak's simpler structure for documenting enlarging lenses, I have made a correspondingly simpler structure here.

Precision Enlarger A
Flurolite Enlarger
or other flat lens boards