Citreon were certainly pioneers.

But the DS was not the only revolutionary car. Everyone knows about the Model T: it was revolutionary, too, not for the technology but for how it upset the car market.

However, another revolutionary car might have been the original Austin 7. This was the reportedly the first mass-market car with the current control layout. It was not only a great success on its own, but it was licensed by a number of other makers, too, which probably helped cement the layout as standard.

Wade.