Seems I remember seeing a commercial about that back in the day.
The transition to full hydrolics was slow. In my research I guess the first of it was in the early 60’s Fiats with the dampers. They were crude and did an adequate job of providing a level, if not rough, ride at speeds. But most of the technology for what we have now was spurred by racing rather than street.
rwood
Been thinking - I think the Citroen had air suspension with pump(s) to level it out/adjust, and not the hydraulics I was thinking about...