Are there any comparisons between this and other style guides from the likes of IBM, DEC, Sun, Apple (Early MacOS), Microsoft, etc? All of these had in-house p

Are there any comparisons between this and other style guides from the likes of IBM, DEC, Sun, Apple (Early MacOS), Microsoft, etc? All of these had in-house printshops, so would have had some style guides even if just to provide consistency for internal use.