I had an AD-SL in high school, the bicycle was circa 1980 when their marketing changed the all European tag so all the component groups were mixed French on the low end and Campagnolo on the high end, although my frame had Shimano dropouts. The main differences from an AD-S were Reynolds 531 main tubes and higgher grade Huret derailleurs (think Austrian Super Course). There were also several higher end models with full Reynolds frames and higher end French and Italian parts.
Austro-Daimler was part of Steyr Daimler Puch which at that point also made Puch bicycles and Mopeds, Puch Pinzgauer off road vehicles, Mercedes G-wagens under contract, Steyr heavy trucks and Steyr guns, plus they used to license build Fiat 500s.
The bicycles and mopeds faded from the US market in the late 80s and the conglomerate started to break up a few years later.
As an aside the US Army's LMTV trucks use the cab from Steyr's last independent truck design before they were swallowed up by MAN and Steyr used to build Chrysler minivans for the European market.