Haven't even mentioned the <c> Mountain Bike parts, Themis Centaur, Olympus and Euclid ,
Have some of that stuff on my Camper tour bike.
Olympus RD has steel back plate on the parallelogram, Euclid upped to a forged aluminum piece.

Record OR group a bit novel, spline and lock-ring fitted #2 and 3 chainrings on the back of the crank,
only large one bolted to the spider... and the beefy smoothly polished center-pull caliper.

Xenon and Athena was in the entry level road bike lineup back in that era..