Macker Sans

Macker Sans is the first versatile font and second incarnation of so, replacing Mellemantle Sans (first draft.) Original font concept was produced by Macker Relashni, with LyonsType redesigning and completing up the font. It also has a condensed version, along with other variants.
As of June 2024 it is still semi-retired, but is seeking a comeback soon. Not for the main company though. 
MT Cylinder has been succeeded as the main replacement for Mack Sans, proving more legibility than its predecessor.