Some of the little roadsters also came with a small wankel. The first
automotive application if I recall correctly.  The RO80 came later.
\While we are talking about the history....
> Did anyone have any experience with the late '60's NSU Prinz (as named
> in the NA market)?  AT least one version had an infinitely variable
> automatic transmission using opposing cones and a belt for the
> transmission.  I always wondered what one of those was like to drive.
>