There is a whole book online about IBM's design in that era: The Interface: IBM and the Transformation of Corporate Design, 1945 -- 1976 by John Harwood https:

There is a whole book online about IBM's design in that era: The Interface: IBM and the Transformation of Corporate Design, 1945 -- 1976 by John Harwood https://muse.jhu.edu/book/24792 https://muse.jhu.edu/book/24792