Designed by F.W. Kleukens and released by Stempel as Ratio-Latein (2 weights) and Ratio-Kursiv in 1923, followed by a set of open caps, Lichte Ratio-Versalien (1924), and a third heavy weight (1926).
Revived by Griffin and King as Ratio Modern (Canada Type, 2011). The digital version includes all styles except for the open caps. The upright regular weight has small caps.